From conception to labor, your infant is constantly growing and developing. Your baby moves through different stages, starting as a blastocyst, then maturing into an embryo, and so a fetus. Around the 5 week marker, your baby's heart will begin to beat, at 27 weeks they'll accept regular sleep and wake cycles, and at 39 weeks your infant is physically adult. Use this timeline to learn how big your baby is, plus how they're developing throughout pregnancy.
Follow your babe'south development week past week, from conception to labor, in these amazingly detailed, doctor-reviewed images.
At the start of this week, you ovulate. Your egg is fertilized 12 to 24 hours after if a sperm penetrates it. Over the next several days, the fertilized egg will get-go 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, called a blastocyst, has begun to produce the pregnancy hormone hCG, which tells your ovaries to finish releasing eggs.
Read near implantation.
Your ball of cells is now officially an embryo. You're now nearly 4 weeks from the get-go of your last menses. It's around this time – when your next period would ordinarily be due – that you might be able to go a positive result on a dwelling 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, but is growing fast. The circulatory system is outset to form, and the tiny "eye" will start to shell this week.
Your babe is the size of a sesame seed.
Read virtually your pregnancy at 5 weeks.
Your infant's nose, mouth and ears are starting to take shape, and their intestines and brain are offset to develop.
Your baby is the size of a lentil.
Read virtually your pregnancy at 6 weeks.
Your baby has doubled in size since final week, merely even so has a tail, which will soon disappear. Piddling hands and feet that expect 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 vii weeks.
Your baby has started moving around, though y'all won't experience motility notwithstanding. Nervus cells are branching out, forming primitive neural pathways. Breathing tubes at present extend from their throat to their developing lungs.
Your infant is the size of a kidney bean.
Read most your pregnancy at eight weeks.
Your baby'southward bones anatomy is developing (they even have tiny earlobes now), but there's much more than to come. Their embryonic tail has disappeared and they weigh just a fraction of an ounce but are nearly to start gaining weight fast.
Your baby is the size of a grape.
Read about your pregnancy at 9 weeks.
Your embryo has completed the most critical portion of development. Their peel is nevertheless translucent, but their tiny limbs tin can bend and fine details similar nails are starting to form.
Your baby is the size of a kumquat
Read virtually your pregnancy at 10 weeks.
Your babe is nearly fully formed. They're kicking, stretching, and even hiccupping as their diaphragm develops, although you lot tin't feel any activity notwithstanding.
Your baby is the size of a fig.
Read about your pregnancy at xi weeks.
This week your baby's reflexes boot in: Their fingers will soon begin to open up and close, toes will curlicue, and their oral cavity will make sucking movements, although you won't feel their movements quite even so.
Your babe is the size of a lime.
Read about your pregnancy at 12 weeks.
This is the last week of your first trimester. Your baby's tiny fingers now have fingerprints, and their veins and organs are clearly visible through their skin. If yous're having a girl, her ovaries contain more 2 million eggs.
Your baby is the size of a pea pod.
Read nearly your pregnancy at xiii weeks.
In this illustration, you can see how big – and yet, how tiny notwithstanding – your baby is as you begin your second trimester.
After the first trimester, a miscarriage is much less probable. And for many moms-to-be, early on pregnancy symptoms like morning sickness and fatigue have faded away. If you're feeling more energetic at present and haven't been exercising, it's a expert fourth dimension to offset a regular pregnancy fitness routine.
Plus: See our ultimate pregnancy to-practice list for the second trimester
Your baby's brain impulses have begun to burn and they're using their facial muscles. Their kidneys are working at present, also. If you have an ultrasound, you may fifty-fifty see them sucking their thumb.
Your baby is the size of a lemon.
Read about your pregnancy at 14 weeks.
Your infant'south eyelids are still fused shut, just they can sense light. If yous shine a flashlight on your stomach, they'll motility away from the beam. Ultrasounds done this calendar week may reveal your baby'due south sex.
Your baby is the size of an apple tree.
Read virtually your pregnancy at fifteen 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 concluding position.
Your baby is the size of an avocado.
Read virtually 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 near your pregnancy at 17 weeks.
Your baby is flexing their artillery and legs, and you 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 bell pepper.
Read about your pregnancy at 18 weeks.
Your babe'southward senses – olfactory property, vision, bear upon, sense of taste and hearing – are developing and they may be able to hear your vocalisation. Talk, sing or read out loud to them, if y'all feel similar it.
Your infant is the size of an heirloom tomato.
Read about your pregnancy at 19 weeks.
Your baby tin can swallow now and their digestive system is producing meconium, the dark, sticky goo that they'll laissez passer in their first poop – either in their diaper or in the womb during delivery.
Your babe is the size of a assistant.
Read near your pregnancy at 20 weeks.
Your baby'south movements have gone from flutters to full-on kicks and jabs against the walls of your womb. You may start to find patterns as you become more familiar with their activity.
Your baby is the size of a carrot.
Read nearly your pregnancy at 21 weeks.
Your infant at present looks nigh like a miniature newborn. Features such equally lips and eyebrows are more than distinct, 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'southward ears are getting better at picking upwardly sounds. Later birth, they may recognize some noises outside the womb that they're hearing inside now.
Your baby is the size of a big mango.
Read about your pregnancy at 23 weeks.
Your baby cuts a pretty long and lean figure, but chubbier times are coming. Their skin is still thin and translucent, but that will begin to change soon as well.
Your babe is the size of an ear of corn.
Read about your pregnancy at 24 weeks.
Your infant's wrinkled skin is starting to fill out with babe fat, making them expect more similar 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 average rutabaga.
Read most your pregnancy at 25 weeks.
Your baby is now inhaling and exhaling amniotic fluid, which helps develop their lungs. These animate movements are proficient practise for that commencement breath of air at nascency.
Your infant is the size of a bunch of scallions.
Read about your pregnancy at 26 weeks.
This is the last week of your second trimester. Your baby now sleeps and wakes on a regular schedule, and their encephalon is very agile. Their lungs aren't fully formed, merely they could office outside the womb with medical assist.
Your baby is the size of a head of cauliflower.
Read about your pregnancy at 27 weeks.
In this illustration, you'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 accept leg cramps as they press on nerves in your hips and back.
At present's the time to do things similar sign up for a childbirth grade, cull a doctor for your infant, and create a babe registry, if yous haven't done so already.
Your baby's eyesight is developing, which may enable them to sense lite filtering in from the exterior. They can blink, and their eyelashes have grown in.
Your infant is the size of a large eggplant.
Read nigh your pregnancy at 28 weeks.
Your baby's muscles and lungs are decorated getting ready to function in the outside earth, and their head is growing to make room for their developing brain.
Your baby is the size of a butternut squash.
Read nigh your pregnancy at 29 weeks.
Your infant is surrounded by a pint and a half of amniotic fluid, although there will be less of information technology as they abound and claim more space inside your uterus.
Your babe is the size of a large cabbage.
Read nearly your pregnancy at 30 weeks.
Your baby can now turn their head from side to side. A protective layer of fat is accumulating nether their skin, filling out their artillery and legs.
Your baby is the size of a coconut.
Read about your pregnancy at 31 weeks.
You're probably gaining about a pound a week now. Half of that goes straight to your baby, who volition gain one-third to half their birth weight in the next seven weeks in preparation for life outside the womb.
Your babe is the size of a large jicama.
Read virtually your pregnancy at 32 weeks.
The bones in your baby's skull aren't fused yet. That allows them to shift every bit their head squeezes through the nascency canal. They won't fully fuse until adulthood.
Your babe is the size of a pineapple.
Read nearly your pregnancy at 33 weeks.
Your baby's central nervous organisation is maturing, as are their lungs. Babies built-in betwixt 34 and 37 weeks who have no other health issues usually practice well in the long run.
Your baby is the size of a cantaloupe.
Read nigh your pregnancy at 34 weeks.
Information technology's getting snug inside your womb! Your infant'south kidneys are fully adult, and their liver can process some waste products.
Your babe is the size of a honeydew melon.
Read well-nigh your pregnancy at 35 weeks.
Your baby is gaining nearly an ounce a solar day. They're also losing most of their lanugo hair that covered their body, along with the vernix caseosa, a waxy substance that was protecting their skin until at present.
Your baby is the size of a head of romaine lettuce.
Read nigh your pregnancy at 36 weeks.
Your due date is very close, and though your baby looks similar a newborn, your baby is now considered at term. Over the next ii weeks their lungs and brain will continue to mature. Yous can go into labor any day now.
Your baby is the size of a agglomeration of Swiss chard.
Read about your pregnancy at 37 weeks.
Are you lot curious most your babe'south eye color? Their irises are not fully pigmented, and then if they're born with blueish optics, they could change to a darker color up until they're about a year quondam.
Your baby is the size of a leek.
Read most your pregnancy at 38 weeks.
At 39 weeks, your baby will be considered full-term. In the analogy, you can come across the mucus 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 babe is the size of a mini watermelon.
Read near your pregnancy at 39 weeks.
If you're by your due date, yous may not be equally tardily as you think, specially if you calculated it solely based on the solar day of your last menstruum. Sometimes women ovulate later than expected.
Your provider will continuously assess your pregnancy to make sure you tin safely proceed your pregnancy.
Your infant is the size of a pocket-size pumpkin.
Read near your pregnancy at 40 weeks.
Your infant is now considered late-term. Going more than than two weeks past your due appointment can put you and your baby at run a risk for complications, and then your provider will probably talk to you about inducing labor. They may perform a Fetal Non-Stress exam to monitor your baby'south fetal centre rate and your contractions to make sure your baby isn't in whatsoever fetal distress.
Read about your pregnancy at 41 weeks.
Meeting your infant for the first time is so exciting – just exactly what will lead up to that moment is unpredictable, and it'south natural to feel nervous. Here's some help every bit you lot prepare for the big day. Observe out how you'll know you're in labor and what to expect from delivery, understand your childbirth choices, and more than.
Acquire the signs and stages of labor
Lookout live birth videos
Take our gratis childbirth grade
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