From conception to labor, your baby is constantly growing and developing. Your baby moves through different stages, starting as a blastocyst, then maturing into an embryo, and then a fetus. Around the 5 week mark, your baby's heart will begin to crush, at 27 weeks they'll have regular slumber and wake cycles, and at 39 weeks your baby is physically developed. Use this timeline to larn how big your baby is, plus how they're developing throughout pregnancy.
Follow your infant'southward evolution week by calendar week, from formulation to labor, in these amazingly detailed, physician-reviewed images.
At the outset of this week, you ovulate. Your egg is fertilized 12 to 24 hours later if a sperm penetrates it. Over the adjacent several days, the fertilized egg will start dividing into multiple cells every bit it travels downwards the fallopian tube, enters your uterus, and starts to burrow into the uterine lining.
Read about fertilization.
At present 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 brawl of cells, chosen a blastocyst, has begun to produce the pregnancy hormone hCG, which tells your ovaries to stop releasing eggs.
Read virtually implantation.
Your brawl of cells is now officially an embryo. You're at present nigh four weeks from the beginning of your last period. It'south around this time – when your adjacent period would normally be due – that you might be able to get a positive upshot on a home pregnancy examination.
Your babe is the size of a poppy seed.
Read about your pregnancy at 4 weeks.
Your baby resembles a tadpole more than a homo, only is growing fast. The circulatory system is showtime to form, and the tiny "centre" volition get-go to beat this week.
Your baby is the size of a sesame seed.
Read most your pregnancy at 5 weeks.
Your baby'southward nose, 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 about your pregnancy at half-dozen weeks.
Your baby has doubled in size since last week, but even so has a tail, which will soon disappear. Little hands and anxiety that look more like paddles are emerging from the developing arms and legs.
Your baby is the size of a huckleberry.
Read well-nigh your pregnancy at 7 weeks.
Your babe has started moving effectually, though you won't feel movement withal. Nerve cells are branching out, forming primitive neural pathways. Breathing tubes now extend from their throat to their developing lungs.
Your baby is the size of a kidney edible bean.
Read virtually your pregnancy at 8 weeks.
Your baby'southward basic anatomy is developing (they fifty-fifty accept tiny earlobes now), but there'due south much more to come. Their embryonic tail has disappeared and they weigh just a fraction of an ounce but are nigh to start gaining weight fast.
Your babe is the size of a grape.
Read about your pregnancy at 9 weeks.
Your embryo has completed the most critical portion of development. Their pare is yet translucent, but their tiny limbs can bend and fine details like nails are starting to form.
Your baby is the size of a kumquat
Read about your pregnancy at ten weeks.
Your baby is almost fully formed. They're kicking, stretching, and even hiccupping as their diaphragm develops, although yous tin't feel whatsoever action withal.
Your baby is the size of a fig.
Read about your pregnancy at 11 weeks.
This week your baby's reflexes boot in: Their fingers will soon begin to open up and close, toes will curl, and their oral cavity will make sucking movements, although yous won't feel their movements quite yet.
Your infant is the size of a lime.
Read about your pregnancy at 12 weeks.
This is the last week of your beginning trimester. Your baby's tiny fingers now take fingerprints, and their veins and organs are clearly visible through their skin. If you're having a girl, her ovaries contain more than than 2 million eggs.
Your babe is the size of a pea pod.
Read nigh your pregnancy at 13 weeks.
In this analogy, you tin see how big – and yet, how tiny still – your baby is as yous begin your 2nd trimester.
After the first trimester, a miscarriage is much less likely. And for many moms-to-be, early pregnancy symptoms like morning sickness and fatigue have faded abroad. If y'all're feeling more energetic now and oasis't been exercising, information technology'southward a skilful fourth dimension to start a regular pregnancy fitness routine.
Plus: Come across our ultimate pregnancy to-do list for the second trimester
Your baby'southward brain impulses take begun to burn and they're using their facial muscles. Their kidneys are working now, too. If you accept an ultrasound, you may even run into them sucking their thumb.
Your baby is the size of a lemon.
Read about your pregnancy at 14 weeks.
Your infant's eyelids are still fused close, just they can sense lite. If yous polish a flashlight on your tummy, they'll movement away from the axle. Ultrasounds washed this week may reveal your infant'due south sexual activity.
Your baby is the size of an apple.
Read about your pregnancy at xv weeks.
The patterning on your baby'due south scalp has begun, though their pilus isn't visible nevertheless. Their legs are more developed, their head is more upright, and their ears are shut to their final position.
Your baby is the size of an avocado.
Read about your pregnancy at xvi weeks.
Your baby can motion their joints, and their skeleton – formerly soft cartilage – is now hardening to bone. The umbilical cord is growing stronger and thicker.
Your babe is the size of a turnip.
Read about your pregnancy at 17 weeks.
Your baby is flexing their arms and legs, and y'all may be able to feel those movements. Internally, a protective coating of myelin is forming around their nerves.
Your baby is the size of a bong pepper.
Read nigh your pregnancy at 18 weeks.
Your baby's senses – odour, vision, touch, sense of taste and hearing – are developing and they may be able to hear your vocalism. Talk, sing or read out loud to them, if you feel like it.
Your baby is the size of an heirloom tomato.
Read about your pregnancy at 19 weeks.
Your babe can swallow now and their digestive system is producing meconium, the night, sticky goo that they'll pass in their commencement poop – either in their diaper or in the womb during delivery.
Your babe is the size of a banana.
Read about your pregnancy at twenty weeks.
Your infant's movements have gone from flutters to full-on kicks and jabs against the walls of your womb. You lot may commencement to discover patterns as yous become more familiar with their action.
Your babe is the size of a carrot.
Read almost your pregnancy at 21 weeks.
Your babe at present looks about like a miniature newborn. Features such as lips and eyebrows are more distinct, but the pigment that volition color their eyes isn't present yet.
Your baby is the size of a spaghetti squash.
Read virtually your pregnancy at 22 weeks.
Your infant's ears are getting better at picking upwardly sounds. After nascence, they may recognize some noises outside the womb that they're hearing inside at present.
Your infant is the size of a large mango.
Read well-nigh your pregnancy at 23 weeks.
Your baby cuts a pretty long and lean figure, but chubbier times are coming. Their skin is all the same thin and translucent, but that will brainstorm to modify shortly besides.
Your baby is the size of an ear of corn.
Read about your pregnancy at 24 weeks.
Your infant'due south wrinkled skin is starting to make full out with baby fat, making them wait more like a newborn. Their hair is outset to come in, and it has color and texture.
Your baby is now the aforementioned weight as an boilerplate rutabaga.
Read about your pregnancy at 25 weeks.
Your baby is now inhaling and exhaling amniotic fluid, which helps develop their lungs. These breathing movements are good practice for that first breath of air at birth.
Your infant is the size of a bunch of scallions.
Read about your pregnancy at 26 weeks.
This is the last calendar week of your second trimester. Your baby now sleeps and wakes on a regular schedule, and their brain is very active. Their lungs aren't fully formed, simply they could function exterior the womb with medical assist.
Your baby is the size of a head of cauliflower.
Read nearly your pregnancy at 27 weeks.
In this illustration, yous'll notice that your growing baby takes upward quite a bit of room these days. In the third trimester, you might be peeing more often or take leg cramps as they press on nerves in your hips and back.
Now'southward the fourth dimension to do things like sign upwards for a childbirth class, choose a doctor for your babe, and create a baby registry, if you haven't done so already.
Your baby's eyesight is developing, which may enable them to sense calorie-free filtering in from the outside. They can glimmer, and their eyelashes have grown in.
Your baby is the size of a large eggplant.
Read well-nigh your pregnancy at 28 weeks.
Your baby'due south muscles and lungs are busy getting ready to function in the outside world, and their head is growing to make room for their developing encephalon.
Your baby is the size of a butternut squash.
Read about your pregnancy at 29 weeks.
Your baby is surrounded past a pint and a half of amniotic fluid, although there will exist less of it every bit they grow and claim more infinite inside your uterus.
Your baby is the size of a large cabbage.
Read virtually your pregnancy at xxx weeks.
Your baby can now turn their head from side to side. A protective layer of fat is accumulating under their skin, filling out their artillery and legs.
Your baby is the size of a coconut.
Read well-nigh your pregnancy at 31 weeks.
Y'all're probably gaining about a pound a calendar week now. Half of that goes straight to your baby, who will gain one-third to half their birth weight in the side by side 7 weeks in preparation for life outside the womb.
Your baby is the size of a large jicama.
Read about your pregnancy at 32 weeks.
The bones in your baby's skull aren't fused withal. That allows them to shift as their head squeezes through the nascency canal. They won't fully fuse until adulthood.
Your baby is the size of a pineapple.
Read most your pregnancy at 33 weeks.
Your babe's central nervous system is maturing, as are their lungs. Babies built-in between 34 and 37 weeks who have no other health problems unremarkably exercise well in the long run.
Your infant is the size of a cantaloupe.
Read most your pregnancy at 34 weeks.
It's getting snug inside your womb! Your babe'south kidneys are fully developed, and their liver can process some waste products.
Your infant is the size of a honeydew melon.
Read about your pregnancy at 35 weeks.
Your baby is gaining about an ounce a solar day. They're also losing virtually of their lanugo hair that covered their body, forth 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 about your pregnancy at 36 weeks.
Your due date is very close, and though your babe looks like a newborn, your babe is now considered at term. Over the side by side two weeks their lungs and brain will continue to mature. You can become into labor whatsoever 24-hour interval now.
Your infant is the size of a bunch of Swiss chard.
Read about your pregnancy at 37 weeks.
Are you curious near your infant's middle color? Their irises are not fully pigmented, then if they're born with blue eyes, they could change to a darker color up until they're about a yr old.
Your baby is the size of a leek.
Read about your pregnancy at 38 weeks.
At 39 weeks, your baby will be considered total-term. In the analogy, you can encounter the fungus plug sealing your uterus and how squished your intestines are now.
Your baby'south physical development is complete, but they're still busy putting on fat and growing bigger.
Your baby is the size of a mini watermelon.
Read virtually your pregnancy at 39 weeks.
If you're by your due date, you may non exist as late as you remember, especially if y'all calculated it solely based on the solar day of your last period. Sometimes women ovulate after than expected.
Your provider will continuously assess your pregnancy to brand sure you tin can safely continue your pregnancy.
Your babe is the size of a small pumpkin.
Read about your pregnancy at 40 weeks.
Your infant is now considered belatedly-term. Going more than two weeks past your due appointment can put you and your infant at take chances for complications, so your provider will probably talk to you most inducing labor. They may perform a Fetal Not-Stress exam to monitor your infant's fetal heart rate and your contractions to make sure your infant isn't in any fetal distress.
Read about your pregnancy at 41 weeks.
Meeting your baby for the first time is so exciting – simply exactly what will lead up to that moment is unpredictable, and information technology'southward natural to feel nervous. Here'south some help every bit yous prepare for the big day. Find out how y'all'll know you're in labor and what to expect from commitment, understand your childbirth choices, and more than.
Acquire the signs and stages of labor
Watch alive nascence videos
Take our free childbirth class
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