From conception to labor, your infant is constantly growing and developing. Your baby moves through different stages, starting as a blastocyst, and so maturing into an embryo, and then a fetus. Around the five calendar week marking, your baby's eye volition begin to beat, at 27 weeks they'll have regular sleep and wake cycles, and at 39 weeks your baby is physically adult. Use this timeline to learn how big your infant is, plus how they're developing throughout pregnancy.
Follow your babe's evolution calendar week by week, from conception to labor, in these amazingly detailed, doctor-reviewed images.
At the start of this calendar 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 beginning dividing into multiple cells as it travels downwardly 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 ball of hundreds of rapidly multiplying cells that will develop into your baby. This ball of cells, chosen a blastocyst, has begun to produce the pregnancy hormone hCG, which tells your ovaries to cease releasing eggs.
Read nigh implantation.
Your ball of cells is now officially an embryo. You lot're now nigh iv weeks from the beginning of your concluding period. It's effectually this time – when your next period would unremarkably be due – that you might be able to go a positive consequence on a home pregnancy test.
Your baby is the size of a poppy seed.
Read about your pregnancy at four weeks.
Your babe resembles a polliwog more than than a homo, but is growing fast. The circulatory arrangement is beginning to form, and the tiny "center" will start to beat this week.
Your baby is the size of a sesame seed.
Read about your pregnancy at v weeks.
Your baby's nose, mouth and ears are starting to accept shape, and their intestines and encephalon are beginning to develop.
Your baby is the size of a lentil.
Read near your pregnancy at 6 weeks.
Your baby has doubled in size since last week, but still has a tail, which will before long disappear. Trivial hands and feet that look more like paddles are emerging from the developing artillery and legs.
Your baby is the size of a blueberry.
Read about your pregnancy at vii weeks.
Your infant has started moving around, though you won't feel movement all the same. 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 bean.
Read nigh your pregnancy at 8 weeks.
Your baby's basic anatomy is developing (they even have tiny earlobes at present), merely there's much more to come. Their embryonic tail has disappeared and they counterbalance but a fraction of an ounce but are about to commencement gaining weight fast.
Your baby is the size of a grape.
Read about your pregnancy at 9 weeks.
Your embryo has completed the most disquisitional portion of development. Their skin is yet translucent, but their tiny limbs tin bend and fine details similar nails are starting to course.
Your baby is the size of a kumquat
Read about your pregnancy at ten weeks.
Your babe is almost fully formed. They're boot, stretching, and fifty-fifty hiccupping as their diaphragm develops, although you can't feel any activity withal.
Your baby is the size of a fig.
Read virtually your pregnancy at 11 weeks.
This calendar week your baby'southward reflexes kick in: Their fingers will soon brainstorm to open and close, toes will curl, and their oral fissure will brand sucking movements, although y'all won't feel their movements quite however.
Your infant is the size of a lime.
Read about your pregnancy at 12 weeks.
This is the last week of your start trimester. Your babe'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 2 million eggs.
Your babe is the size of a pea pod.
Read about your pregnancy at thirteen weeks.
In this analogy, you can meet how big – and withal, how tiny still – your infant is equally you begin your second trimester.
Later on the outset trimester, a miscarriage is much less likely. And for many moms-to-be, early pregnancy symptoms like morning time sickness and fatigue have faded abroad. If you're feeling more energetic now and haven't been exercising, it's a good time to start a regular pregnancy fettle routine.
Plus: Meet our ultimate pregnancy to-practise list for the 2nd trimester
Your baby'due south brain impulses take begun to burn down and they're using their facial muscles. Their kidneys are working now, too. If you accept an ultrasound, you may fifty-fifty see them sucking their pollex.
Your babe is the size of a lemon.
Read virtually your pregnancy at 14 weeks.
Your baby'due south eyelids are however fused shut, but they can sense low-cal. If you smooth a flashlight on your tummy, they'll move away from the beam. Ultrasounds done this week may reveal your baby's sexual practice.
Your baby is the size of an apple.
Read virtually your pregnancy at 15 weeks.
The patterning on your infant'southward scalp has begun, though their hair isn't visible yet. Their legs are more than developed, their head is more upright, and their ears are close to their final position.
Your baby is the size of an avocado.
Read about your pregnancy at sixteen weeks.
Your infant can move their joints, and their skeleton – formerly soft cartilage – is at present hardening to bone. The umbilical string is growing stronger and thicker.
Your baby is the size of a turnip.
Read about your pregnancy at 17 weeks.
Your babe is flexing their arms and legs, and yous may exist able to experience those movements. Internally, a protective coating of myelin is forming around their fretfulness.
Your baby is the size of a bell pepper.
Read almost your pregnancy at xviii weeks.
Your baby'south senses – aroma, vision, touch, taste and hearing – are developing and they may be able to hear your vocalization. Talk, sing or read out loud to them, if you feel like it.
Your babe is the size of an heirloom tomato.
Read nigh your pregnancy at 19 weeks.
Your infant can consume now and their digestive system is producing meconium, the night, sticky goo that they'll laissez passer in their showtime poop – either in their diaper or in the womb during commitment.
Your baby is the size of a banana.
Read about your pregnancy at 20 weeks.
Your baby'due south movements have gone from flutters to total-on kicks and jabs against the walls of your womb. You may start to notice patterns as yous become more familiar with their activity.
Your baby is the size of a carrot.
Read nigh your pregnancy at 21 weeks.
Your infant now looks almost like a miniature newborn. Features such as lips and eyebrows are more than distinct, but the pigment that will color their eyes isn't present yet.
Your babe is the size of a spaghetti squash.
Read nigh your pregnancy at 22 weeks.
Your baby'due south ears are getting ameliorate at picking upwards sounds. After birth, they may recognize some noises outside the womb that they're hearing within 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 figure, but chubbier times are coming. Their peel is nevertheless thin and translucent, but that volition begin to change before long too.
Your baby is the size of an ear of corn.
Read well-nigh your pregnancy at 24 weeks.
Your babe's wrinkled peel is starting to fill out with baby fat, making them expect more like a newborn. Their hair is beginning to come in, and it has color and texture.
Your baby is now the same weight as an average rutabaga.
Read virtually your pregnancy at 25 weeks.
Your babe is at present inhaling and exhaling amniotic fluid, which helps develop their lungs. These breathing movements are good exercise for that get-go breath of air at birth.
Your baby is the size of a bunch of scallions.
Read about your pregnancy at 26 weeks.
This is the last week of your 2nd trimester. Your baby at present sleeps and wakes on a regular schedule, and their brain is very active. Their lungs aren't fully formed, but they could function outside the womb with medical aid.
Your baby is the size of a head of cauliflower.
Read about your pregnancy at 27 weeks.
In this illustration, you'll observe that your growing baby takes up quite a bit of room these days. In the third trimester, y'all might be peeing more often or have leg cramps as they press on nerves in your hips and back.
Now's the fourth dimension to do things like sign up for a childbirth class, choose a doctor for your baby, and create a baby registry, if you haven't washed so already.
Your infant'southward eyesight is developing, which may enable them to sense light filtering in from the outside. They can blink, and their eyelashes have grown in.
Your baby is the size of a large eggplant.
Read about your pregnancy at 28 weeks.
Your infant's muscles and lungs are decorated getting prepare to function in the exterior world, and their caput 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 baby is surrounded by a pint and a one-half of amniotic fluid, although at that place will be less of it as they grow and merits more space inside your uterus.
Your infant is the size of a large cabbage.
Read about your pregnancy at 30 weeks.
Your baby tin now plow their head 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 almost your pregnancy at 31 weeks.
You're probably gaining about a pound a week now. Half of that goes straight to your baby, who will gain one-third to half their birth weight in the next seven weeks in training for life exterior the womb.
Your baby is the size of a large jicama.
Read nearly your pregnancy at 32 weeks.
The bones in your baby'south skull aren't fused yet. That allows them to shift as their caput squeezes through the nativity canal. They won't fully fuse until adulthood.
Your infant is the size of a pineapple.
Read about your pregnancy at 33 weeks.
Your infant'south primal nervous system is maturing, equally are their lungs. Babies born between 34 and 37 weeks who take no other health problems usually practice well in the long run.
Your infant is the size of a cantaloupe.
Read about your pregnancy at 34 weeks.
It's getting snug inside your womb! Your baby's kidneys are fully developed, and their liver can procedure some waste material products.
Your baby is the size of a honeydew melon.
Read about your pregnancy at 35 weeks.
Your baby is gaining virtually an ounce a day. They're also losing most of their lanugo hair that covered their torso, forth with the vernix caseosa, a waxy substance that was protecting their pare until at present.
Your baby is the size of a head of romaine lettuce.
Read about 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 next two weeks their lungs and brain will go along to mature. You tin go into labor any day now.
Your baby is the size of a bunch of Swiss chard.
Read about your pregnancy at 37 weeks.
Are yous curious nigh your baby's eye color? Their irises are not fully pigmented, so if they're built-in with blue eyes, they could change to a darker colour up until they're about a yr old.
Your babe is the size of a leek.
Read near your pregnancy at 38 weeks.
At 39 weeks, your baby will be considered total-term. In the illustration, you lot can see the mucus plug sealing your uterus and how squished your intestines are now.
Your baby's physical development is complete, but they're however 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 appointment, you may not be as belatedly every bit you retrieve, especially if yous calculated it solely based on the twenty-four hour period of your last period. Sometimes women ovulate subsequently than expected.
Your provider will continuously assess your pregnancy to brand sure you tin safely continue your pregnancy.
Your baby is the size of a small-scale pumpkin.
Read about your pregnancy at twoscore weeks.
Your babe is at present considered late-term. Going more than than two weeks past your due date can put you and your baby at run a risk for complications, so your provider volition probably talk to you about inducing labor. They may perform a Fetal Not-Stress test to monitor your infant'south fetal heart rate and your contractions to brand sure your babe isn't in any fetal distress.
Read about your pregnancy at 41 weeks.
Meeting your babe for the get-go time is so heady – only exactly what will pb up to that moment is unpredictable, and it's natural to feel nervous. Here'due south some assistance as you set up for the big 24-hour interval. Find out how yous'll know you're in labor and what to expect from commitment, understand your childbirth choices, and more.
Learn the signs and stages of labor
Watch live nascence videos
Take our free childbirth class
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