From formulation to labor, your baby is constantly growing and developing. Your babe moves through dissimilar stages, starting as a blastocyst, then maturing into an embryo, and then a fetus. Around the 5 calendar week marker, your baby'south middle will begin to beat, at 27 weeks they'll take regular slumber and wake cycles, and at 39 weeks your babe is physically developed. Use this timeline to larn how big your baby is, plus how they're developing throughout pregnancy.
Follow your baby'south development calendar week by week, from conception to labor, in these amazingly detailed, physician-reviewed images.
At the first of this week, you ovulate. Your egg is fertilized 12 to 24 hours later on if a sperm penetrates it. Over the next several days, the fertilized egg will start dividing into multiple cells equally it travels down the fallopian tube, enters your uterus, and starts to burrow into the uterine lining.
Read virtually fertilization.
At present nestled in the nutrient-rich lining of your uterus is a microscopic brawl 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 virtually implantation.
Your ball of cells is now officially an embryo. You're now virtually 4 weeks from the beginning of your last period. It's around this time – when your next period would normally be due – that you might exist able to become a positive result on a home pregnancy test.
Your baby is the size of a poppy seed.
Read about your pregnancy at 4 weeks.
Your baby resembles a tadpole more than a human being, simply is growing fast. The circulatory system is offset to class, and the tiny "middle" will offset to beat this week.
Your baby is the size of a sesame seed.
Read nigh your pregnancy at 5 weeks.
Your infant's nose, mouth and ears are starting to accept shape, and their intestines and brain are kickoff 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 even so has a tail, which will before long disappear. Petty easily and feet that wait more 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 babe has started moving effectually, though you won't feel motion 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 bean.
Read about your pregnancy at 8 weeks.
Your baby'due south bones anatomy is developing (they fifty-fifty have tiny earlobes at present), simply at that place's much more to come. Their embryonic tail has disappeared and they weigh just a fraction of an ounce only are about to start gaining weight fast.
Your baby is the size of a grape.
Read near your pregnancy at 9 weeks.
Your embryo has completed the most critical portion of evolution. Their skin is however translucent, simply their tiny limbs can bend and fine details like nails are starting to course.
Your baby is the size of a kumquat
Read almost your pregnancy at 10 weeks.
Your baby is almost fully formed. They're kicking, stretching, and even hiccupping as their diaphragm develops, although you can't feel any activity yet.
Your baby is the size of a fig.
Read almost your pregnancy at xi weeks.
This week your baby'south reflexes kick in: Their fingers will soon brainstorm to open and close, toes will gyre, and their rima oris will make sucking movements, although you won't experience their movements quite all the same.
Your baby is the size of a lime.
Read well-nigh your pregnancy at 12 weeks.
This is the last calendar week of your first trimester. Your baby'southward tiny fingers now have fingerprints, and their veins and organs are conspicuously visible through their skin. If you're having a girl, her ovaries contain more than than 2 million eggs.
Your infant is the size of a pea pod.
Read about your pregnancy at 13 weeks.
In this illustration, you can run across how big – and yet, how tiny still – your baby is as you brainstorm your second trimester.
Afterward the first trimester, a miscarriage is much less probable. And for many moms-to-be, early pregnancy symptoms like morn sickness and fatigue have faded abroad. If you're feeling more energetic now and haven't been exercising, it's a practiced time to start a regular pregnancy fitness routine.
Plus: See our ultimate pregnancy to-do listing for the second trimester
Your baby's brain impulses take begun to burn and they're using their facial muscles. Their kidneys are working now, as well. If you have an ultrasound, you may even see them sucking their thumb.
Your baby is the size of a lemon.
Read about your pregnancy at 14 weeks.
Your babe's eyelids are withal fused shut, but they can sense lite. If you shine a flashlight on your tummy, they'll movement away from the beam. Ultrasounds done this calendar week may reveal your infant'southward sex.
Your infant is the size of an apple.
Read about your pregnancy at 15 weeks.
The patterning on your babe'southward scalp has begun, though their hair isn't visible yet. Their legs are more developed, their head is more than upright, and their ears are close to their final position.
Your baby is the size of an avocado.
Read about your pregnancy at 16 weeks.
Your baby can move their joints, and their skeleton – formerly soft cartilage – is at present hardening to bone. The umbilical cord is growing stronger and thicker.
Your baby is the size of a turnip.
Read almost your pregnancy at 17 weeks.
Your baby is flexing their arms and legs, and you may exist able to experience those movements. Internally, a protective coating of myelin is forming around their nerves.
Your babe is the size of a bell pepper.
Read about your pregnancy at 18 weeks.
Your baby'due south senses – scent, 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 lot feel like it.
Your infant 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 baby is the size of a banana.
Read about your pregnancy at 20 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 notice patterns as yous become 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, but the pigment that will color their optics isn't present yet.
Your baby is the size of a spaghetti squash.
Read about your pregnancy at 22 weeks.
Your baby's ears are getting better at picking up sounds. After nativity, they may recognize some noises outside the womb that they're hearing inside now.
Your babe is the size of a big mango.
Read about your pregnancy at 23 weeks.
Your baby cuts a pretty long and lean figure, just chubbier times are coming. Their skin is still thin and translucent, but that will begin to change shortly also.
Your baby is the size of an ear of corn.
Read about your pregnancy at 24 weeks.
Your baby'south wrinkled skin is starting to fill up out with babe fatty, making them look more like a newborn. Their hair is beginning to come in, and information technology has colour and texture.
Your baby is now the same weight as an boilerplate rutabaga.
Read most your pregnancy at 25 weeks.
Your infant 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 almost your pregnancy at 26 weeks.
This is the last week of your 2d trimester. Your babe now sleeps and wakes on a regular schedule, and their brain is very agile. Their lungs aren't fully formed, only they could function outside the womb with medical help.
Your infant is the size of a head of cauliflower.
Read about your pregnancy at 27 weeks.
In this illustration, yous'll detect that your growing baby takes upwards quite a bit of room these days. In the third trimester, y'all might be peeing more oft or take leg cramps as they printing on fretfulness in your hips and back.
At present'due south the time to practise things like sign up for a childbirth class, choose a doctor for your baby, and create a infant registry, if you haven't done so already.
Your infant'south eyesight is developing, which may enable them to sense light filtering in from the outside. They tin blink, and their eyelashes have grown in.
Your baby is the size of a large eggplant.
Read about your pregnancy at 28 weeks.
Your baby's muscles and lungs are decorated getting gear up to function in the outside earth, and their caput is growing to brand 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 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 nearly your pregnancy at 30 weeks.
Your baby can at present plow their head from side to side. A protective layer of fat is accumulating nether their skin, filling out their arms and legs.
Your infant is the size of a coconut.
Read about your pregnancy at 31 weeks.
Y'all're probably gaining about a pound a week at present. Half of that goes straight to your baby, who will gain one-third to half their nativity weight in the side by side seven weeks in preparation for life exterior the womb.
Your baby is the size of a large jicama.
Read about your pregnancy at 32 weeks.
The bones in your baby'due south skull aren't fused yet. That allows them to shift as their head squeezes through the nascence canal. 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 betwixt 34 and 37 weeks who accept no other health problems usually do well in the long run.
Your infant is the size of a cantaloupe.
Read near your pregnancy at 34 weeks.
It's getting snug inside your womb! Your baby's kidneys are fully developed, and their liver can process some waste material products.
Your babe is the size of a honeydew melon.
Read about your pregnancy at 35 weeks.
Your babe is gaining about an ounce a day. They're also 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 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 baby looks like a newborn, your baby is now considered at term. Over the next ii weeks their lungs and brain volition continue to mature. You can go into labor any twenty-four hours now.
Your baby is the size of a agglomeration of Swiss chard.
Read about your pregnancy at 37 weeks.
Are you lot curious about your baby's eye color? Their irises are non fully pigmented, so if they're born with blue eyes, they could alter 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 volition exist considered full-term. In the illustration, you tin can come across the fungus plug sealing your uterus and how squished your intestines are now.
Your babe's concrete development is complete, but they're still decorated putting on fat and growing bigger.
Your infant is the size of a mini watermelon.
Read almost your pregnancy at 39 weeks.
If you're past your due date, you may not be every bit late every bit you think, especially if you calculated it solely based on the mean solar day of your terminal period. Sometimes women ovulate later than expected.
Your provider volition continuously assess your pregnancy to make sure you can safely continue your pregnancy.
Your baby is the size of a small pumpkin.
Read about your pregnancy at xl weeks.
Your baby is now considered late-term. Going more than two weeks by your due date can put you and your baby at risk for complications, so your provider will probably talk to yous nearly inducing labor. They may perform a Fetal Non-Stress test to monitor your baby's fetal eye rate and your contractions to make sure your babe isn't in any fetal distress.
Read about your pregnancy at 41 weeks.
Meeting your baby for the start time is so exciting – but exactly what will lead up to that moment is unpredictable, and it's natural to feel nervous. Here'southward some help every bit you prepare for the big day. Notice out how you'll know you're in labor and what to wait from commitment, understand your childbirth choices, and more than.
Learn the signs and stages of labor
Sentinel alive nascency videos
Take our complimentary childbirth class
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