From conception to labor, your baby is constantly growing and developing. Your baby moves through different stages, starting equally a blastocyst, and so maturing into an embryo, and then a fetus. Around the 5 week mark, your infant'south heart volition begin to beat, at 27 weeks they'll accept regular sleep and wake cycles, and at 39 weeks your baby is physically developed. Use this timeline to larn how big your babe is, plus how they're developing throughout pregnancy.
Follow your baby's development week by week, from conception to labor, in these amazingly detailed, doctor-reviewed images.
At the starting time of this calendar week, you ovulate. Your egg is fertilized 12 to 24 hours later if a sperm penetrates it. Over the side by side several days, the fertilized egg volition offset dividing into multiple cells every bit it travels down the fallopian tube, enters your uterus, and starts to burrow into the uterine lining.
Read about fertilization.
Now nestled in the nutrient-rich lining of your uterus is a microscopic brawl of hundreds of rapidly multiplying cells that will develop into your babe. This ball of cells, called a blastocyst, has begun to produce the pregnancy hormone hCG, which tells your ovaries to stop releasing eggs.
Read almost implantation.
Your ball of cells is now officially an embryo. You're now about 4 weeks from the beginning of your last period. It'due south around this time – when your next period would usually exist due – that yous might be able to get a positive result on a home pregnancy test.
Your babe is the size of a poppy seed.
Read well-nigh your pregnancy at 4 weeks.
Your babe resembles a tadpole more than a human, but is growing fast. The circulatory system is beginning to form, and the tiny "heart" will first to beat this week.
Your babe is the size of a sesame seed.
Read near your pregnancy at 5 weeks.
Your infant's nose, mouth and ears are starting to take shape, and their intestines and brain are beginning to develop.
Your infant is the size of a lentil.
Read near your pregnancy at 6 weeks.
Your baby has doubled in size since last week, but however has a tail, which will soon disappear. Trivial hands and anxiety that wait more than like paddles are emerging from the developing arms and legs.
Your infant is the size of a blueberry.
Read about your pregnancy at 7 weeks.
Your baby 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 about your pregnancy at viii weeks.
Your baby's basic anatomy is developing (they even have tiny earlobes at present), but there'south much more than to come up. Their embryonic tail has disappeared and they weigh only a fraction of an ounce just are about to start gaining weight fast.
Your babe is the size of a grape.
Read most your pregnancy at nine weeks.
Your embryo has completed the most critical portion of evolution. Their skin is still translucent, but their tiny limbs can bend and fine details similar nails are starting to course.
Your baby is the size of a kumquat
Read near your pregnancy at 10 weeks.
Your babe is almost fully formed. They're kicking, stretching, and even hiccupping as their diaphragm develops, although you can't feel any activity withal.
Your baby is the size of a fig.
Read well-nigh your pregnancy at eleven weeks.
This calendar week your baby's reflexes kick in: Their fingers will before long begin to open up and shut, toes will curl, and their rima oris 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 concluding week of your first trimester. Your baby's tiny fingers at present have fingerprints, and their veins and organs are clearly visible through their skin. If you lot're having a girl, her ovaries contain more than than 2 1000000 eggs.
Your infant is the size of a pea pod.
Read about your pregnancy at 13 weeks.
In this analogy, you tin can see how big – and even so, how tiny notwithstanding – your baby is equally you brainstorm your second 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 away. If y'all're feeling more energetic at present and oasis't been exercising, it's a good fourth dimension to outset a regular pregnancy fitness routine.
Plus: See our ultimate pregnancy to-do list for the 2d trimester
Your babe's brain impulses accept begun to fire and they're using their facial muscles. Their kidneys are working now, too. If you lot have an ultrasound, you may even see them sucking their thumb.
Your babe is the size of a lemon.
Read about your pregnancy at fourteen weeks.
Your baby'southward eyelids are still fused shut, but they can sense light. If you smoothen a flashlight on your tummy, they'll motility away from the axle. Ultrasounds done this calendar week may reveal your baby's sex.
Your babe is the size of an apple.
Read nigh your pregnancy at 15 weeks.
The patterning on your baby's scalp has begun, though their hair isn't visible yet. Their legs are more than developed, their caput is more upright, and their ears are close to their final position.
Your infant is the size of an avocado.
Read almost your pregnancy at xvi weeks.
Your infant can move their joints, and their skeleton – formerly soft cartilage – is now hardening to bone. The umbilical cord is growing stronger and thicker.
Your infant is the size of a turnip.
Read most your pregnancy at 17 weeks.
Your baby is flexing their arms and legs, and you may exist able to feel those movements. Internally, a protective coating of myelin is forming around their nerves.
Your infant is the size of a bell pepper.
Read most your pregnancy at 18 weeks.
Your baby's senses – smell, vision, touch, taste and hearing – are developing and they may be able to hear your voice. Talk, sing or read out loud to them, if you feel similar it.
Your baby is the size of an heirloom tomato.
Read about your pregnancy at 19 weeks.
Your baby can swallow now and their digestive system is producing meconium, the dark, gluey goo that they'll pass in their beginning poop – either in their diaper or in the womb during delivery.
Your infant is the size of a banana.
Read nigh your pregnancy at twenty weeks.
Your baby's movements have gone from flutters to full-on kicks and jabs confronting the walls of your womb. You may start to observe patterns as you become more familiar with their activity.
Your baby is the size of a carrot.
Read about your pregnancy at 21 weeks.
Your infant now looks almost like a miniature newborn. Features such equally lips and eyebrows are more singled-out, only the pigment that will color their eyes isn't present yet.
Your baby is the size of a spaghetti squash.
Read most your pregnancy at 22 weeks.
Your baby's ears are getting better at picking upwards sounds. After birth, they may recognize some noises outside the womb that they're hearing inside now.
Your infant is the size of a large mango.
Read nearly your pregnancy at 23 weeks.
Your baby cuts a pretty long and lean figure, but chubbier times are coming. Their peel is still thin and translucent, just that will begin to change soon also.
Your baby is the size of an ear of corn.
Read near your pregnancy at 24 weeks.
Your infant'southward wrinkled skin is starting to fill out with baby fat, making them wait more like a newborn. Their hair is outset to come up in, and it has color and texture.
Your infant is now the same weight equally an average rutabaga.
Read about your pregnancy at 25 weeks.
Your babe is now inhaling and exhaling amniotic fluid, which helps develop their lungs. These animate movements are proficient do for that first breath of air at nascence.
Your baby is the size of a bunch of scallions.
Read most your pregnancy at 26 weeks.
This is the last week of your second trimester. Your babe now sleeps and wakes on a regular schedule, and their encephalon is very agile. Their lungs aren't fully formed, just they could part outside the womb with medical help.
Your infant is the size of a caput of cauliflower.
Read nearly your pregnancy at 27 weeks.
In this analogy, you'll observe that your growing baby takes upward quite a bit of room these days. In the third trimester, y'all might be peeing more often or have leg cramps equally they press on nerves in your hips and back.
At present'due south the time to practise things like sign upwards for a childbirth course, choose a doctor for your baby, and create a babe registry, if y'all haven't done then already.
Your infant's eyesight is developing, which may enable them to sense lite filtering in from the outside. They can blink, and their eyelashes have grown in.
Your baby is the size of a big eggplant.
Read about your pregnancy at 28 weeks.
Your infant'southward muscles and lungs are busy getting ready to office in the exterior world, and their head is growing to make room for their developing brain.
Your babe is the size of a butternut squash.
Read near your pregnancy at 29 weeks.
Your infant is surrounded by a pint and a half of amniotic fluid, although there will be less of it as they abound and claim more space inside your uterus.
Your baby is the size of a large cabbage.
Read about your pregnancy at xxx weeks.
Your baby can now turn their caput from side to side. A protective layer of fat is accumulating under their skin, filling out their arms and legs.
Your baby is the size of a coconut.
Read about your pregnancy at 31 weeks.
You're probably gaining near a pound a week now. Half of that goes straight to your babe, who will proceeds ane-third to half their birth weight in the next seven weeks in preparation for life outside the womb.
Your baby is the size of a big jicama.
Read well-nigh your pregnancy at 32 weeks.
The bones in your babe'due south skull aren't fused withal. That allows them to shift as their head squeezes through the birth culvert. They won't fully fuse until adulthood.
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 wellness issues ordinarily do well in the long run.
Your baby is the size of a cantaloupe.
Read nigh your pregnancy at 34 weeks.
It'southward getting snug inside your womb! Your baby's kidneys are fully developed, and their liver can procedure some waste products.
Your baby is the size of a honeydew melon.
Read about your pregnancy at 35 weeks.
Your infant is gaining about an ounce a day. They're too losing most of their lanugo hair that covered their body, forth with the vernix caseosa, a waxy substance that was protecting their skin until now.
Your infant is the size of a head of romaine lettuce.
Read nearly your pregnancy at 36 weeks.
Your due appointment is very close, and though your baby looks like a newborn, your baby is now considered at term. Over the side by side 2 weeks their lungs and brain will continue to mature. You can go into labor any day now.
Your baby is the size of a bunch of Swiss chard.
Read virtually your pregnancy at 37 weeks.
Are y'all curious nearly your baby's eye colour? Their irises are not fully pigmented, then if they're born with blue eyes, they could change to a darker colour upward until they're about a year old.
Your baby is the size of a leek.
Read most your pregnancy at 38 weeks.
At 39 weeks, your baby will exist considered total-term. In the analogy, you can see the mucus plug sealing your uterus and how squished your intestines are now.
Your baby's physical development is complete, simply they're even so busy putting on fat and growing bigger.
Your baby is the size of a mini watermelon.
Read about your pregnancy at 39 weeks.
If you're past your due date, you may not be as late as you think, especially if you calculated it solely based on the day of your last period. Sometimes women ovulate after than expected.
Your provider volition continuously assess your pregnancy to brand certain you can safely continue your pregnancy.
Your baby is the size of a minor pumpkin.
Read about your pregnancy at twoscore weeks.
Your baby is now considered late-term. Going more than two weeks past your due date tin can put you and your baby at take a chance for complications, and so your provider will probably talk to you virtually inducing labor. They may perform a Fetal Non-Stress examination to monitor your baby's fetal centre rate and your contractions to make certain your baby isn't in any fetal distress.
Read about your pregnancy at 41 weeks.
Meeting your babe for the first time is so heady – simply exactly what will lead upward to that moment is unpredictable, and it's natural to feel nervous. Hither's some assistance every bit you lot prepare for the big 24-hour interval. Find out how you'll know yous're in labor and what to expect from delivery, understand your childbirth choices, and more.
Learn the signs and stages of labor
Watch live birth videos
Have our free childbirth class
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