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Your baby begins equally a tiny cluster of cells, but during the nine-month procedure of pregnancy she becomes an astonishing infant with facial features, a beating heart and kicking legs. Find out what's happening with infant's development week by week.
Calendar week 1
pregnancy calendar week one uterus
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Baby? What baby? This concept may exist a piffling hard to wrap your head around, but even though you're technically in the outset week of pregnancy, yous're not quite expecting -- nonetheless. Here's the deal: Considering it'southward generally impossible to know the verbal moment of conception, about healthcare providers count 40 weeks from the first 24-hour interval of your final menstrual period (LMP) to calculate your due date. According to this method, they date the beginning of "pregnancy" from about 2 weeks earlier the sperm penetrates the egg -- which is where you are right at present. Already spotted that pink line on a dwelling pregnancy test? Yous're further along than yous recall, so skip alee to Calendar week 4.
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Week 2
pregnancy calendar week 2
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So far your babe doesn't be, simply this is the week you ovulate. Your ovary releases a ripened egg (ovum) into your fallopian tube, where information technology volition patiently expect the sperm that have survived the 6- to 8-inch expedition through your cervix and uterus. While 75 to 900 meg sperm embark on this journeying, less than a k actually get in past your neck -- and only one lucky swimmer will have the honor of penetrating the egg at the moment of conception.
Week 3
Fetal Development Pregnancy calendar week three
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Amazingly, your kid's sexual activity and all of her inherited genetic characteristics -- such as eye color, hair color, skin, and body type -- have been prepare since the moment of conception. Your developing baby, now called a zygote, has 46 chromosomes -- 23 from y'all and 23 from your partner. These chromosomes assist determine your baby'southward sex activity and traits such as center and hair color, and, to some extent, personality and intelligence. Later fertilization, the brawl of cells, at present an embryo, will wrap up its journey through the fallopian tube and burrow itself into the wall of your uterus for nourishment -- a procedure known as implantation. If you're having multiples, the human action has already been done. Congenial twins occur when 2 split up eggs are fertilized by ii different sperm and each baby has his own placenta and amniotic sac. If one fertilized egg splits and develops into 2 fetuses, the result is identical twins. They may share a placenta, merely each babe usually has a separate amniotic sac.
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Calendar week iv
Fetal Development Pregnancy calendar week 4
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And then what's going on in your womb this calendar week? Your embryo may be minuscule, simply trust the states: Super-important developments are already under style. This calendar week the embryo splits into 2 parts. 1 half volition become the placenta, a special tissue that delivers must-have nutrients and oxygen to your baby throughout your entire pregnancy. In the other one-half, the embryo itself continues to grow, and a canvass of cells has just begun to create the neural tube, where your infant'due south encephalon, spinal cord and backbone volition ultimately form.
Calendar week 5
Pregnancy week 5
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This week, your baby's ticker will beginning beating for the first time! (Neither you nor your doc can hear it yet, but information technology may be possible to see the movement on an ultrasound.) And your niggling one has been really busy growing! The embryo now has three singled-out layers: the outer ectoderm, which volition grade the nervous organization, ears, optics, inner ear and many connective tissues; the endoderm, or inner layer, which will grow into internal organs like the lungs, intestines and bladder; and the middle mesoderm, which will eventually make way for the eye and circulatory system. In the weeks to come, the mesoderm will likewise evolve into basic, muscles, kidneys and reproductive organs.
Week 6
Pregnancy week 6
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By the finish of this week your baby will have tripled in size! His heart is now beating with a regular rhythm. It's still too faint to be picked up by your medico'due south stethoscope, but if you take an ultrasound at some point over the side by side few weeks it will probably be visible as a tiny, pulsing dot in the middle of his mini body. Fun fact: From at present until birth, your child's heart will beat about 150 times a infinitesimal -- twice the average adult rate. Likewise this week, your baby's encephalon hemispheres are forming -- and brain waves tin can now be recorded.
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Week 7
Pregnancy calendar week 7
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Your baby is already developing amazingly distinct facial features. Dark spots marking the areas where her optics and nostrils will exist, and a trivial mouth and ears are starting to form, too. Your baby's encephalon is also growing more than complex; if y'all could accept a peek, it would exist clearly visible inside the transparent skull. In fact, nerve cells in your baby's brain are growing at an astonishing rate -- 100,000 cells per minute! And she's started to motion in modest, hasty motions, although you won't feel these movements until nearly your 4th month of pregnancy.
Week 8
Pregnancy week 8
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Your baby's growth spurt continues: In the last two weeks he has quadrupled in size. As he gets bigger, his delicate facial features are condign more refined, with his ears, upper lip, and the teeny tip of his nose all clearly visible. His eyelids volition besides take shape for the first time this week and his heart is growing stronger past the day.
Calendar week 9
Pregnancy calendar week 9
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Even though yous all the same accept to expect another eight weeks to find out if your new addition will be a boy or a girl, this calendar week, your infant gets the appurtenances she'll need to, well, make her own baby one day. That's right -- reproductive organs are beginning to form now, along with some other key organs, similar the pancreas and gallbladder. At this signal your baby has doubled in size and her caput, which is about one-half the length of her entire torso, is tucked downward toward her breast. Her tiny fingers are growing longer, and the ends are slightly enlarged right now -- this is where those unique fingerprints will ultimately course.
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Week 10
Pregnancy calendar week ten
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Up until now your baby was classified equally an embryo, but past the terminate of this week he will be a fetus and lots of changes are on the way. Paddle-like, or webbed, hands and feet volition now separate into fingers and toes, bones will begin to harden and his kidneys are now producing urine. Nearly impressive? At this point your babe's brain is developing at astounding rates -- about 250,000 neurons are forming every minute! The end of the embryonic stage likewise marks a turning point for evolution dangers -- your infant is much less susceptible to them now.
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Calendar week 11
Pregnancy week 11 female
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Did you know your baby tin can breathe underwater? She's doing it right now. At weeks 10 and 11, the fetus will offset to inhale and exhale small amounts of amniotic fluid, which helps your baby's lungs to abound and develop. Also this week, your infant's ears are scooting upwards to the sides of his head. Sure, your baby's head is nevertheless disproportionally large compared to the rest of his trunk, simply this will even out as he continues to grow and develop in the womb.
- Boy or Daughter? Find out now.
Calendar week 12
Pregnancy week 12
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As your infant'due south muscles first to bulk up at this stage, he's getting busy stretching and kicking. When you put your hand on your belly, your baby volition likely wiggle in response because his reflexes are starting to develop -- though it's likewise early on to feel his movements. He'll as well start to open up and close his fingers, gyre his toes, and jerk and boot his arms and legs.
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Week 13
fetal evolution week 13
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Your baby is constantly getting bigger and cuter, and his face is looking more human-like every day. His ears take moved upwardly from his neck into place and his eyes -- which are looking more and more than like your baby dejection (or browns, or greens) -- take moved from the sides of the head to the forepart of the face. Up until now, his caput has been outpacing his trunk, only now his trunk is growing faster. His legs still need to grow longer, but this week his arms will lengthen to be proportionate with his trunk, and he'll be able to stick his thumb in his mouth. Also by now, all of your baby'south essential organs and systems have formed.
- Boy or Girl? Find out now.
Calendar week fourteen
Pregnancy calendar week fourteen
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The roof of your baby's tiny oral fissure is fully formed at present, and her constant sucking reflexes are helping to create full, cherubic cheeks. If you're having a boy, the prostate is forming, and if you're having a girl, her ovaries are moving down into her pelvis.
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Week 15
Pregnancy week 15
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Lanugo, your baby'southward commencement ultrafine, downy hair, now covers his back, shoulders, ears, and brow. It helps him retain trunk oestrus, but in one case he gains enough fat to do the task, this hair will fall off -- probably before birth. Facial expressions are your baby's newest fob -- he can frown, squint, grimace and wince. Don't worry -- he'south just flexing his facial muscles, not indicating his mood.
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Week 16
Pregnancy calendar week 16
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Your babe's delicate skeleton continues to harden from rubbery cartilage to bone. Still, his bones will remain somewhat flexible for an easier trip through the nativity canal. The umbilical cord has fully matured with one vein and two arteries that are protected by Wharton's jelly (a thick substance that makes the string glace so it can move freely around your baby). By the way, if you're having a girl, hundreds of thousands of eggs are forming in her ovaries this calendar week -- your future grandchildren!
- Boy or Girl? Find out at present.
Calendar week 17
Fetal Development Pregnancy calendar week 17
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Finally, your baby'due south artillery, legs, and torso have defenseless upward to the size of his head. Baby starts plumping up this week, as trunk fat is deposited under his skin and sweat glands develop. Also worth noting: The placenta is almost equally large as your baby. Information technology provides vitamins, minerals, proteins, fats, and oxygen, along with removing waste and filtering carbon dioxide.
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Calendar week xviii
Pregnancy week xviii
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Do you and your partner talk to your baby? Well, with the bones and nerves in her ears at present developed enough to function, she can hear all sorts of sounds -- including blood coursing through the umbilical cord, your growling tummy, and your heartbeat. In fact, sudden or loud noises may startle her. Go alee and sing, tell stories or play music for your baby now. Even though your babe doesn't sympathise what these sounds are now, somewhen she'll recognize your voice better than whatever other.
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Week 19
Pregnancy calendar week 19
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Vernix caseosa begins to coat the skin. The greasy, cheese-similar white coating helps regulate trunk temperature and protects your baby's skin while it's submerged in amniotic fluid. Past the fourth dimension your babe is born, most of the vernix will exist gone. Your baby's heartbeat is growing stronger now and it'due south about twice every bit fast as yours.
- Boy or Girl? Find out now.
Week 20
Pregnancy calendar week 20 male
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Your babe is as happy equally a clam in your womb, as his well-adult limbs proceed to explore by curling, flexing, and boot. And as his pilus, nails and eyebrows go on to sprout, your fetus is looking remarkably more than and more like Mom and Dad every day.
- Boy or Girl? Find out now.
Week 21
Pregnancy week 21
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Part of your baby'due south growth spurt at this point is probable because his breadbasket is now equipped to first arresting energy-boosting nutrients from the amniotic fluid he's swallowing in there. Most of your baby's nourishment is still coming straight from the placenta, though.
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Week 22
Fetal Development Pregnancy Week 22
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Your baby'south previously see-through skin will now go opaque. However, it will remain wrinkly, red, and covered in vernix until more fat helps to fill it out. As well this week, he'south fine-tuning his sense of touch (cheers to maturing brain cells and nerve endings). Your babe may experiment with these newfound skills past feeling his face or anything else he can get his hands on. This week, your baby's eyebrows kickoff growing and hair will starting time sprouting on the scalp, but this varies -- your babe may grow a thick caput of dark pilus or he may enter the globe bald.
- Boy or Girl? Find out at present.
Week 23
Pregnancy week 23
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Billions of encephalon cells volition develop in your baby's brain over the next couple of weeks. These will control all of your babe'southward movements and sensory, and basic life functions like breathing. As well around this time, some major changes are happening with your baby's lungs. Surfactant is being produced, a substance that enables the air sacs to inflate and the lungs to fully expand. Right now he's withal breathing amniotic fluid, but when he'south born he'll be set up for air.
- Boy or Girl? Discover out at present.
Week 24
Pregnancy week 24
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You might notice that your baby is very busy during the next few weeks. Right now she's small enough to have plenty of room to move and groove in your abdomen. She may even respond to your soothing voice or the rubbing of your belly by calming downwards, while loud sounds or a tap on your belly could crusade her to get warning. Also, because the balance-controlling inner ear has developed, your baby can finally tell if she's upside downward or right side up, so moving around takes on new meaning.
- Boy or Girl? Find out now.
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Calendar week 25
Pregnancy week 25
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Your baby'south first bowel motion has been forming in the big intestine. The thick, dark poop is called meconium and it's typically excreted shortly after he's born. Occasionally babies pass this stool before they're born, which means it must be suctioned subsequently nascency to clear it from the lungs.
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Week 26
Pregnancy week 26
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Your baby has settled into a distinct sleep-wake blueprint. You may notice that sometimes he's very active and kicking or punching, and other times he sleeps. If you lot're lucky, these patterns will mimic yours.
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Calendar week 27
Pregnancy calendar week 27
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Your infant has been hiccuping every once in a while for several weeks, and now you lot might actually feel these baby hiccups, which are triggered by the involuntary movements of his diaphragm. (In adults, this is followed by the quick closure of our vocal cords, which is what makes that familiar "hic" sound.) Just considering your baby's trachea is filled with fluid instead of air, his fetal hiccups don't brand a sound. They volition make your belly jump though, which is fun to run across and experience!
- Boy or Daughter? Observe out now.
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Week 28
Pregnancy week 28
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Until now, your babe'southward eyelids accept been fused shut, merely this calendar week he'll begin to open and close his eyes. What'south more than, his irises are now filled with pigment. Even if yous could peek at the colour of his peepers at present, though, they might not stay that color, as a baby'southward eyes tin change up until he's half dozen months to 1 twelvemonth old (especially if your piddling guy is born with baby blues).
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Week 29
Pregnancy week 29
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Your baby is getting stronger by the minute. This week, her pushes, kicks, and rolls volition probable occur more ofttimes -- and forcefully. And then don't exist surprised if you feel an actress-strong karate chop or ii! Around this time, the part of your baby'south brain associated with intelligence and personality becomes far more complex. Yous tin can go to know your baby by paying attention to how she reacts to different foods, sounds, and lights.
- Boy or Girl? Find out now.
Week xxx
Pregnancy week 30
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From this point on your infant volition gain about a half pound each week. All that baby weight is for more than filling out his chubby cheeks. Now that all of his major body systems are in place and operation, he needs padding to protect and insulate his organs. His built-up fatty tissue will besides help him regulate his body temperature after nascence and provide the energy he needs. Because your babe is adding fatty and growing bigger, you might find his movements go less frequent -- it'southward getting harder for him to maneuver. Simply if yous're not feeling any jabs or the occasional kick, tell your health care provider.
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Week 31
Fetal Evolution Pregnancy Week 31
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Your infant is gaining more than weight than height at this indicate. Considering she's too big to stretch out, she's now forced into the fetal position, which she'll stay in until birth. This this week too boasts some exciting reproductive developments. Having a boy? His testicles are moving through the groin on their way into the scrotum. And if you lot've got a daughter in there, her clitoris is already relatively formed.
Week 32
Pregnancy week 32
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While a teeny function of you lot might be thinking "Get this child outta here ASAP!" nosotros bet the residue is sincerely hoping he'll stay in in that location a while longer. That said, you can breathe a sigh of relief for this calendar week's of import milestone. Almost all babies built-in at this stage or later survive and get on to have very healthy, normal lives. Past this time all of his major organs are fully performance except the lungs, which need but a fleck more fourth dimension to mature completely.
Week 33
Pregnancy week 33
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Your infant doesn't take much elbow room these days -- and, happily, that'south probably going to mean fewer elbow jabs to the ribs for y'all. Because space in your uterus is running out, your baby becomes less agile at this point in the pregnancy. You lot may also observe that her movements are affected by your daily routine -- how much and when you lot eat, what position yous are in and sounds from the globe outside tin all affect your baby's activity level.
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Week 34
Pregnancy week 34
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Your baby'southward preparing for his arrival in just a few curt weeks! This week, the protective vernix caseosa (that cheese-like, white, waxy blanket that'due south keeping his pare safe) begins to thicken, ensuring that his altogether suit stays smooth and well-moisturized during D-day. Your baby will likely arrive covered in the stuff, especially in the folds under his arms, behind his ears, and in the groin expanse. But information technology'll all be washed off very shortly after birth -- during his first-e'er bathroom.
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Calendar week 35
Fetal Development Pregnancy Week 35
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At this bespeak, your unborn baby should be positioned with her head facing down toward the neck and vagina. About 97 percentage of babies have adopted this position past this point; the rest remain in what's known as breech position -- when the butt or feet are in identify to come out outset. If your babe's among this minority, it does increment your odds of needing a C-section, but there's a good take a chance your healthcare provider tin can correct the problem by turning him around manually with pressure practical on your belly. Called an external version, this process has nearly a 65 percentage success rate.
Week 36
Pregnancy week 36
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Your baby is working hard to accrue all the fat he tin can at this point, and that layer of fat has now rounded out his face. This build-up of fat -- about 15 percentage of his total weight--will help him maintain his body temperature and give him a store of energy. His sucking muscles, which are quite powerful, take as well finished developing at present, and are ready for their first real feeding -- your baby's going to be hungry shortly after he arrives.
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Week 37
Pregnancy calendar week 37
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The umbilical cord begins passing antibodies to your baby in preparation for commitment. By stockpiling antibodies, your baby will be improve prepared for the disease and germs he'll encounter outside the womb. Your baby'south senses are also getting more than time to hone their burgeoning skills. He can hear and recognize your voice. In one case he'southward born you'll exist able to see him turn his head in your management when he hears you speak. He knows his mom! Forth with his hearing, his eyesight is improving each day. His fingers are too becoming more coordinated. He can grasp his face or toes. And subsequently nascency he'll be able to grab onto your finger.
Week 38
Pregnancy week 38
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Your baby's hanging out, enjoying her final few weeks of snuggly comfort in your womb. Nonetheless, if she were born today, she would still be considered a full-term infant. Her brain -- in accuse of complicated jobs similar regulating breathing, digestion, and circulation -- is functioning better every solar day. Babies come up to term anywhere between 38 and 42 weeks; your xl-week due date simply marks the midpoint of this period.
Week 39
Pregnancy week 39
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By now your baby has likely reached his nascence weight (typically betwixt half dozen and 9 pounds) and length (18 to 22 inches from head to toe). He'southward accumulated enough trunk fat to stay cozy later he'south built-in, and your placenta continues to supply him with nutrients and antibodies that will help fend off illnesses. If you could sneak a peek at your baby'due south final moments before nascency, y'all'd run into that his head is down toward your pelvis (if he's not in the bottom-down or breech presentation, in which case your healthcare provider might suggest a cesarean section). Your baby'southward body will either be direct up and down, called longitudinal, or positioned at an angle, called oblique. Along with spying your infant'due south body position, if you lot could see his caput, y'all'd observe that he'south caput-down and facing your spine, which is the nigh mutual position (called inductive presentation). But sometimes, babies present head-downward but facing toward your belly. This is chosen occiput or cephalic posterior. Your baby might lean slightly to ane side or the other, significant that he is either "right" or "left" anterior, or "right" or "left" posterior.
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Week 40
Pregnancy week 40
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When your babe arrives, he will exist evaluated and graded (zero to two points each) on the following factors: activity and muscle tone, pulse (middle charge per unit), grimace response (medically known equally "reflex irritability"), advent (pare coloration) and respiration (breathing rate and effort). This sum volition determine the baby'south Apgar score -- an initial measure of his health. Most good for you babies have an Apgar between seven and ix (few babies go a 10).
Week 41
nurse bringing babe to new mother
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Equally astonishing as information technology is to encounter your baby for the first fourth dimension, don't be alarmed if she's not exactly, um, equally good-looking as you imagined she would be. Those delivered vaginally tend to have temporarily misshapen heads and puffy eyes. And your baby will probably be coated with vernix caseosa, but nearly of it will be washed off during the first bath. It takes near newborns a few weeks to get that adorable, chubby-cheeked baby look downward pat.
Week 42
pregnant woman holding stomach
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You're probably wondering what that stubborn little bugger could nevertheless perchance be doing in your womb! Well-nigh likely he's all the same happily moving about in your belly, and you should go along counting fetal kicks to be certain. He's also likely gaining weight, which means you lot may be giving birth to a bigger baby.
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Source: https://www.parents.com/pregnancy/week-by-week/baby-development/
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