From conception to labor, your babe is constantly growing and developing. Your infant moves through different stages, starting equally a blastocyst, then maturing into an embryo, and and so a fetus. Around the 5 week mark, your infant's heart will begin to shell, at 27 weeks they'll have regular sleep and wake cycles, and at 39 weeks your infant is physically developed. Use this timeline to learn how big your babe is, plus how they're developing throughout pregnancy.
Follow your infant's development week by calendar week, from conception to labor, in these amazingly detailed, doctor-reviewed images.
At the first of this week, you lot ovulate. Your egg is fertilized 12 to 24 hours later if a sperm penetrates it. Over the adjacent several days, the fertilized egg volition start dividing into multiple cells as it travels down the fallopian tube, enters your uterus, and starts to burrow into the uterine lining.
Read nigh fertilization.
Now nestled in the nutrient-rich lining of your uterus is a microscopic ball of hundreds of rapidly multiplying cells that will develop into your baby. This ball of cells, called a blastocyst, has begun to produce the pregnancy hormone hCG, which tells your ovaries to stop releasing eggs.
Read about implantation.
Your ball of cells is now officially an embryo. You're now near 4 weeks from the beginning of your last period. It's effectually this time – when your next period would normally be due – that you might exist able to get a positive issue on a domicile pregnancy examination.
Your babe is the size of a poppy seed.
Read nigh your pregnancy at four weeks.
Your baby resembles a tadpole more than than a man, but is growing fast. The circulatory system is starting time to class, and the tiny "center" will first to beat this week.
Your baby is the size of a sesame seed.
Read well-nigh your pregnancy at five weeks.
Your baby'due south olfactory organ, oral cavity and ears are starting to take shape, and their intestines and brain are beginning to develop.
Your baby is the size of a lentil.
Read nearly your pregnancy at six weeks.
Your baby has doubled in size since concluding calendar week, but still has a tail, which will soon disappear. Fiddling hands and feet that await more like paddles are emerging from the developing arms and legs.
Your baby is the size of a blueberry.
Read nearly your pregnancy at 7 weeks.
Your baby has started moving effectually, though you won't experience movement yet. Nerve cells are branching out, forming primitive neural pathways. Breathing tubes at present extend from their pharynx to their developing lungs.
Your baby is the size of a kidney edible bean.
Read most your pregnancy at 8 weeks.
Your baby'south basic anatomy is developing (they even have tiny earlobes now), merely there's much more to come. Their embryonic tail has disappeared and they weigh but a fraction of an ounce but are nigh to start gaining weight fast.
Your baby is the size of a grape.
Read about your pregnancy at 9 weeks.
Your embryo has completed the most critical portion of evolution. Their skin is withal translucent, only their tiny limbs can bend and fine details like nails are starting to class.
Your baby is the size of a kumquat
Read about your pregnancy at x weeks.
Your baby is almost fully formed. They're kicking, stretching, and even hiccupping as their diaphragm develops, although yous can't feel any activity even so.
Your baby is the size of a fig.
Read well-nigh your pregnancy at 11 weeks.
This calendar week your baby's reflexes kick in: Their fingers will soon begin to open and close, toes volition curl, and their mouth will make sucking movements, although you won't feel their movements quite yet.
Your baby is the size of a lime.
Read about your pregnancy at 12 weeks.
This is the last calendar week of your first trimester. Your infant's tiny fingers now accept fingerprints, and their veins and organs are clearly visible through their pare. If you're having a girl, her ovaries contain more ii 1000000 eggs.
Your baby is the size of a pea pod.
Read about your pregnancy at xiii weeks.
In this illustration, you can encounter how big – and however, how tiny still – your infant is as you begin your second trimester.
Subsequently the first trimester, a miscarriage is much less likely. And for many moms-to-be, early pregnancy symptoms like morning sickness and fatigue accept faded abroad. If you're feeling more energetic at present and haven't been exercising, information technology'south a good time to beginning a regular pregnancy fitness routine.
Plus: See our ultimate pregnancy to-do list for the second trimester
Your baby'south encephalon impulses have begun to fire and they're using their facial muscles. Their kidneys are working now, too. If yous have an ultrasound, you may even see them sucking their thumb.
Your babe is the size of a lemon.
Read nigh your pregnancy at 14 weeks.
Your babe'due south eyelids are yet fused shut, but they can sense calorie-free. If you lot polish a flashlight on your stomach, they'll move away from the beam. Ultrasounds done this week may reveal your baby's sex.
Your babe is the size of an apple.
Read about your pregnancy at 15 weeks.
The patterning on your baby's scalp has begun, though their hair isn't visible even so. Their legs are more than adult, their head is more upright, and their ears are close to their concluding position.
Your baby is the size of an avocado.
Read almost your pregnancy at 16 weeks.
Your babe can move their joints, and their skeleton – formerly soft cartilage – is now hardening to bone. The umbilical string is growing stronger and thicker.
Your babe is the size of a turnip.
Read nigh your pregnancy at 17 weeks.
Your babe is flexing their arms and legs, and you may exist able to feel those movements. Internally, a protective coating of myelin is forming effectually their fretfulness.
Your baby is the size of a bell pepper.
Read about your pregnancy at 18 weeks.
Your baby's senses – smell, vision, touch, gustatory modality and hearing – are developing and they may exist able to hear your voice. Talk, sing or read out loud to them, if you feel similar information technology.
Your baby is the size of an heirloom tomato.
Read near your pregnancy at xix weeks.
Your baby can consume now and their digestive organization is producing meconium, the nighttime, sticky goo that they'll pass in their starting time poop – either in their diaper or in the womb during delivery.
Your baby is the size of a assistant.
Read about your pregnancy at twenty weeks.
Your infant's movements accept gone from flutters to full-on kicks and jabs against the walls of your womb. Y'all may start to notice patterns as you go more familiar with their activity.
Your baby is the size of a carrot.
Read nearly your pregnancy at 21 weeks.
Your infant at present looks almost similar a miniature newborn. Features such equally lips and eyebrows are more distinct, merely the pigment that will color their eyes isn't nowadays yet.
Your baby is the size of a spaghetti squash.
Read almost your pregnancy at 22 weeks.
Your baby'south ears are getting better at picking up sounds. Later birth, they may recognize some noises exterior the womb that they're hearing inside now.
Your baby is the size of a large mango.
Read about your pregnancy at 23 weeks.
Your baby cuts a pretty long and lean effigy, only chubbier times are coming. Their pare is still thin and translucent, just that volition brainstorm to change soon too.
Your baby is the size of an ear of corn.
Read about your pregnancy at 24 weeks.
Your infant's wrinkled skin is starting to fill out with baby fat, making them look more like a newborn. Their pilus is beginning to come up in, and it has color and texture.
Your baby is at present the aforementioned weight as an boilerplate rutabaga.
Read most your pregnancy at 25 weeks.
Your baby is now inhaling and exhaling amniotic fluid, which helps develop their lungs. These breathing movements are adept practice for that outset breath of air at birth.
Your baby is the size of a bunch of scallions.
Read most your pregnancy at 26 weeks.
This is the last calendar week of your 2d trimester. Your baby now sleeps and wakes on a regular schedule, and their brain is very agile. Their lungs aren't fully formed, but they could function outside the womb with medical help.
Your baby is the size of a head of cauliflower.
Read about your pregnancy at 27 weeks.
In this illustration, you'll notice that your growing infant takes upwardly quite a bit of room these days. In the tertiary trimester, you might be peeing more than often or have leg cramps as they press on nerves in your hips and back.
Now's the time to do things similar sign upwards for a childbirth class, choose a doctor for your baby, and create a baby registry, if y'all oasis't done so already.
Your baby's eyesight is developing, which may enable them to sense light filtering in from the outside. They can glimmer, and their eyelashes have grown in.
Your baby is the size of a big eggplant.
Read most your pregnancy at 28 weeks.
Your infant's muscles and lungs are decorated getting ready to function in the exterior world, and their caput is growing to make room for their developing brain.
Your baby is the size of a butternut squash.
Read about your pregnancy at 29 weeks.
Your babe is surrounded by a pint and a half of amniotic fluid, although there will be less of it as they grow and claim more space inside your uterus.
Your baby is the size of a large cabbage.
Read about your pregnancy at thirty weeks.
Your baby can now plough their head from side to side. A protective layer of fat is accumulating under their peel, filling out their arms and legs.
Your baby is the size of a coconut.
Read almost your pregnancy at 31 weeks.
Yous're probably gaining about a pound a week now. One-half of that goes straight to your baby, who will gain 1-3rd to half their nascence weight in the side by side vii weeks in preparation for life outside the womb.
Your baby is the size of a large jicama.
Read virtually your pregnancy at 32 weeks.
The bones in your baby's skull aren't fused yet. That allows them to shift as their head squeezes through the birth culvert. They won't fully fuse until machismo.
Your baby is the size of a pineapple.
Read about your pregnancy at 33 weeks.
Your baby's central nervous system is maturing, as are their lungs. Babies born between 34 and 37 weeks who have no other health issues usually practise well in the long run.
Your baby is the size of a cantaloupe.
Read about your pregnancy at 34 weeks.
It's getting snug within your womb! Your babe's kidneys are fully developed, and their liver can process some waste material products.
Your baby is the size of a honeydew melon.
Read nigh your pregnancy at 35 weeks.
Your infant is gaining about an ounce a day. They're also losing nearly of their lanugo pilus that covered their body, along with the vernix caseosa, a waxy substance that was protecting their skin until now.
Your baby is the size of a head of romaine lettuce.
Read nearly your pregnancy at 36 weeks.
Your due date is very shut, and though your infant looks like a newborn, your baby is now considered at term. Over the side by side two weeks their lungs and brain will continue to mature. You can go into labor whatever day now.
Your infant is the size of a agglomeration of Swiss chard.
Read near your pregnancy at 37 weeks.
Are y'all curious well-nigh your baby's centre color? Their irises are non fully pigmented, and then if they're born with blue eyes, they could change to a darker color up until they're about a twelvemonth quondam.
Your baby is the size of a leek.
Read about your pregnancy at 38 weeks.
At 39 weeks, your infant will exist considered full-term. In the illustration, you tin can see the fungus plug sealing your uterus and how squished your intestines are now.
Your babe'southward physical development is complete, merely they're withal decorated putting on fatty and growing bigger.
Your baby is the size of a mini watermelon.
Read near your pregnancy at 39 weeks.
If you're past your due date, you may not be as belatedly as you think, peculiarly if y'all calculated it solely based on the solar day of your last period. Sometimes women ovulate after than expected.
Your provider volition continuously assess your pregnancy to make certain you can safely continue your pregnancy.
Your infant is the size of a small pumpkin.
Read nigh your pregnancy at 40 weeks.
Your babe is now considered late-term. Going more than 2 weeks past your due date can put yous and your baby at risk for complications, and then your provider will probably talk to you about inducing labor. They may perform a Fetal Non-Stress test to monitor your baby's fetal centre rate and your contractions to make certain your infant isn't in any fetal distress.
Read about your pregnancy at 41 weeks.
Meeting your infant for the first fourth dimension is and then exciting – only exactly what will pb up to that moment is unpredictable, and it'southward natural to feel nervous. Hither's some help as you gear up for the big day. Find out how you'll know you're in labor and what to expect from commitment, understand your childbirth choices, and more than.
Learn the signs and stages of labor
Picket live birth videos
Take our costless childbirth class
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