From conception to labor, your baby is constantly growing and developing. Your babe moves through different stages, starting as a blastocyst, and so maturing into an embryo, and then a fetus. Around the v calendar week mark, your baby's heart volition begin to beat, at 27 weeks they'll have regular slumber and wake cycles, and at 39 weeks your baby is physically developed. Use this timeline to learn how big your infant is, plus how they're developing throughout pregnancy.
Follow your baby's evolution week by week, from formulation to labor, in these amazingly detailed, md-reviewed images.
At the start of this week, you ovulate. Your egg is fertilized 12 to 24 hours subsequently if a sperm penetrates it. Over the next several days, the fertilized egg volition start dividing into multiple cells as information technology 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 quickly multiplying cells that will develop into your babe. This brawl 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 at present well-nigh 4 weeks from the beginning of your last menses. It's effectually this time – when your side by side period would unremarkably exist due – that you might be able to get a positive result on a dwelling house pregnancy test.
Your baby is the size of a poppy seed.
Read about your pregnancy at 4 weeks.
Your baby resembles a tadpole more a human, just is growing fast. The circulatory system is start to form, and the tiny "eye" will kickoff to shell this week.
Your babe is the size of a sesame seed.
Read virtually your pregnancy at 5 weeks.
Your baby's nose, mouth 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 6 weeks.
Your baby has doubled in size since terminal week, but all the same has a tail, which will soon disappear. Petty hands and feet that expect more like paddles are emerging from the developing arms and legs.
Your infant is the size of a blueberry.
Read near your pregnancy at 7 weeks.
Your baby has started moving around, though you won't feel motion still. Nerve cells are branching out, forming archaic neural pathways. Breathing tubes at present extend from their throat to their developing lungs.
Your babe is the size of a kidney edible bean.
Read about your pregnancy at viii weeks.
Your baby'southward basic anatomy is developing (they even have tiny earlobes now), but there's much more than to come up. Their embryonic tail has disappeared and they weigh just a fraction of an ounce merely are nearly to beginning gaining weight fast.
Your babe is the size of a grape.
Read about your pregnancy at 9 weeks.
Your embryo has completed the almost critical portion of development. Their skin is still translucent, but their tiny limbs can bend and fine details similar nails are starting to grade.
Your baby is the size of a kumquat
Read about your pregnancy at 10 weeks.
Your baby is almost fully formed. They're kicking, stretching, and fifty-fifty hiccupping every bit their diaphragm develops, although you can't feel whatsoever activity however.
Your baby is the size of a fig.
Read about your pregnancy at 11 weeks.
This week your infant's reflexes boot in: Their fingers volition presently brainstorm to open and close, toes will whorl, and their oral fissure will make sucking movements, although you won't feel their movements quite still.
Your baby is the size of a lime.
Read about your pregnancy at 12 weeks.
This is the final week of your beginning trimester. Your baby'due south tiny fingers now take fingerprints, and their veins and organs are conspicuously visible through their skin. If yous're having a girl, her ovaries contain more than than 2 million eggs.
Your baby is the size of a pea pod.
Read most your pregnancy at 13 weeks.
In this illustration, y'all tin run across how big – and yet, how tiny still – your baby is every bit y'all brainstorm your second trimester.
After the first trimester, a miscarriage is much less likely. And for many moms-to-be, early pregnancy symptoms similar morning sickness and fatigue have faded away. If you're feeling more energetic now and haven't been exercising, information technology'southward a good time to commencement a regular pregnancy fettle routine.
Plus: See our ultimate pregnancy to-exercise listing for the 2nd trimester
Your baby's encephalon impulses have begun to burn and they're using their facial muscles. Their kidneys are working now, too. If you have an ultrasound, you may even meet them sucking their pollex.
Your baby is the size of a lemon.
Read most your pregnancy at 14 weeks.
Your baby's eyelids are even so fused shut, but they can sense light. If you smoothen a flashlight on your tummy, they'll movement away from the beam. Ultrasounds washed this week may reveal your baby'south sex.
Your baby is the size of an apple.
Read about your pregnancy at xv weeks.
The patterning on your baby's scalp has begun, though their hair isn't visible yet. Their legs are more developed, their caput is more upright, and their ears are close to their terminal position.
Your baby is the size of an avocado.
Read virtually your pregnancy at 16 weeks.
Your babe can move their joints, and their skeleton – formerly soft cartilage – is at present hardening to os. The umbilical cord is growing stronger and thicker.
Your infant is the size of a turnip.
Read about your pregnancy at 17 weeks.
Your infant is flexing their arms and legs, and you may be able to experience those movements. Internally, a protective coating of myelin is forming around their nerves.
Your baby is the size of a bell pepper.
Read nearly your pregnancy at xviii weeks.
Your infant's senses – aroma, vision, touch, taste and hearing – are developing and they may be able to hear your vocalisation. Talk, sing or read out loud to them, if you feel like it.
Your baby is the size of an heirloom lycopersicon esculentum.
Read nearly your pregnancy at 19 weeks.
Your baby can swallow now and their digestive system is producing meconium, the dark, glutinous goo that they'll pass in their outset poop – either in their diaper or in the womb during delivery.
Your infant is the size of a banana.
Read about your pregnancy at 20 weeks.
Your infant'southward movements accept gone from flutters to full-on kicks and jabs confronting the walls of your womb. Y'all may start to notice patterns every bit you go more familiar with their activity.
Your baby is the size of a carrot.
Read about your pregnancy at 21 weeks.
Your baby now looks almost similar a miniature newborn. Features such equally lips and eyebrows are more than singled-out, only the pigment that volition color their eyes isn't nowadays yet.
Your baby is the size of a spaghetti squash.
Read near your pregnancy at 22 weeks.
Your babe's ears are getting meliorate at picking up sounds. After birth, they may recognize some noises exterior the womb that they're hearing inside at present.
Your baby is the size of a big mango.
Read about your pregnancy at 23 weeks.
Your babe cuts a pretty long and lean effigy, but chubbier times are coming. Their pare is still thin and translucent, but that will begin to change soon too.
Your babe is the size of an ear of corn.
Read about your pregnancy at 24 weeks.
Your baby'due south wrinkled skin is starting to fill out with baby fat, making them look more similar a newborn. Their hair is beginning to come in, and information technology has color and texture.
Your baby is at present the aforementioned weight every bit an average 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 exercise for that first breath of air at nascence.
Your baby is the size of a bunch of scallions.
Read near your pregnancy at 26 weeks.
This is the last calendar week of your 2d trimester. Your infant at present sleeps and wakes on a regular schedule, and their brain is very active. Their lungs aren't fully formed, only they could function outside the womb with medical assistance.
Your baby is the size of a head of cauliflower.
Read about your pregnancy at 27 weeks.
In this analogy, you'll find that your growing babe takes up quite a bit of room these days. In the tertiary trimester, you might be peeing more than frequently or accept leg cramps every bit they press on fretfulness in your hips and back.
Now's the time to do things similar sign up for a childbirth grade, choose a doctor for your baby, and create a infant registry, if you oasis't done then already.
Your babe'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 most your pregnancy at 28 weeks.
Your baby's muscles and lungs are decorated getting ready to function in the outside globe, and their head 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 infant is surrounded past a pint and a one-half of amniotic fluid, although there volition be less of it every bit they grow and claim more space inside your uterus.
Your infant is the size of a large cabbage.
Read about your pregnancy at 30 weeks.
Your baby can now turn their head from side to side. A protective layer of fat is accumulating under their peel, filling out their arms and legs.
Your infant is the size of a coconut.
Read about your pregnancy at 31 weeks.
Yous're probably gaining about a pound a calendar week now. One-half of that goes direct to your baby, who will gain i-tertiary to one-half their birth 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 near your pregnancy at 32 weeks.
The bones in your baby'southward skull aren't fused yet. 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 virtually your pregnancy at 33 weeks.
Your baby's key nervous organisation is maturing, equally are their lungs. Babies born between 34 and 37 weeks who have no other health issues normally exercise well in the long run.
Your baby is the size of a cantaloupe.
Read near your pregnancy at 34 weeks.
Information technology'due south getting snug inside your womb! Your baby'due south kidneys are fully developed, and their liver can process some waste products.
Your babe is the size of a honeydew melon.
Read virtually your pregnancy at 35 weeks.
Your baby is gaining most an ounce a day. They're too losing most of their lanugo hair that covered their body, along with the vernix caseosa, a waxy substance that was protecting their peel until now.
Your baby is the size of a head of romaine lettuce.
Read about your pregnancy at 36 weeks.
Your due engagement is very close, and though your baby looks like a newborn, your baby is now considered at term. Over the next two weeks their lungs and encephalon will go on to mature. You can go into labor whatsoever 24-hour interval now.
Your baby is the size of a agglomeration of Swiss chard.
Read about your pregnancy at 37 weeks.
Are yous curious about your baby's eye colour? Their irises are not fully pigmented, so if they're built-in with blueish eyes, they could alter to a darker color upward until they're about a yr old.
Your baby is the size of a leek.
Read virtually your pregnancy at 38 weeks.
At 39 weeks, your babe will exist considered full-term. In the analogy, you lot tin can run into the fungus plug sealing your uterus and how squished your intestines are now.
Your baby's physical development is consummate, but they're still busy putting on fat and growing bigger.
Your baby is the size of a mini watermelon.
Read most your pregnancy at 39 weeks.
If you're past your due date, you may not be as tardily as you recollect, particularly if you calculated it solely based on the day of your last menstruum. Sometimes women ovulate afterward than expected.
Your provider will continuously assess your pregnancy to make sure you tin safely keep your pregnancy.
Your baby is the size of a small pumpkin.
Read about your pregnancy at 40 weeks.
Your baby is now considered tardily-term. Going more than two weeks past your due engagement tin put you and your baby at adventure for complications, then your provider volition probably talk to you about inducing labor. They may perform a Fetal Non-Stress examination to monitor your baby's fetal center rate and your contractions to make sure your baby isn't in whatsoever fetal distress.
Read near your pregnancy at 41 weeks.
Coming together your baby for the outset time is so exciting – but exactly what will lead up to that moment is unpredictable, and it's natural to feel nervous. Hither'south some assistance every bit you fix for the big mean solar day. Find out how you'll know you'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
Accept our free childbirth class
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