From formulation to labor, your babe is constantly growing and developing. Your babe moves through dissimilar stages, starting as a blastocyst, and then maturing into an embryo, and then a fetus. Effectually the 5 week marking, your baby's heart will begin to beat, at 27 weeks they'll have regular sleep and wake cycles, and at 39 weeks your babe is physically adult. Use this timeline to learn how big your baby is, plus how they're developing throughout pregnancy.
Follow your baby'southward development calendar week by week, from conception to labor, in these amazingly detailed, doctor-reviewed images.
At the starting time of this week, you ovulate. Your egg is fertilized 12 to 24 hours later on if a sperm penetrates information technology. Over the adjacent several days, the fertilized egg volition start dividing into multiple cells equally information technology travels downwards the fallopian tube, enters your uterus, and starts to burrow into the uterine lining.
Read about fertilization.
At present nestled in the nutrient-rich lining of your uterus is a microscopic ball of hundreds of apace 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 almost implantation.
Your ball of cells is now officially an embryo. Y'all're now nearly 4 weeks from the beginning of your last menstruum. It's around this time – when your next period would normally be due – that you might be able to get a positive event on a dwelling pregnancy test.
Your baby is the size of a poppy seed.
Read about your pregnancy at 4 weeks.
Your infant resembles a tadpole more than a human, but is growing fast. The circulatory system is beginning to form, and the tiny "heart" volition kickoff to beat this calendar week.
Your baby is the size of a sesame seed.
Read nearly your pregnancy at 5 weeks.
Your infant's nose, mouth and ears are starting to accept shape, and their intestines and brain are beginning to develop.
Your baby is the size of a lentil.
Read nearly your pregnancy at 6 weeks.
Your infant has doubled in size since last week, but still has a tail, which will soon disappear. Little easily and feet that look more like paddles are emerging from the developing arms and legs.
Your baby is the size of a blueberry.
Read about your pregnancy at 7 weeks.
Your baby has started moving around, though you won't feel motility yet. Nervus cells are branching out, forming archaic neural pathways. Breathing tubes now extend from their pharynx to their developing lungs.
Your infant is the size of a kidney edible bean.
Read almost your pregnancy at viii weeks.
Your baby's bones beefcake is developing (they even have tiny earlobes now), just at that place'due south much more to come. Their embryonic tail has disappeared and they weigh just a fraction of an ounce just are about 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 skin is still translucent, only their tiny limbs tin can bend and fine details like nails are starting to class.
Your infant is the size of a kumquat
Read nigh your pregnancy at 10 weeks.
Your babe is nigh fully formed. They're kicking, stretching, and even hiccupping equally their diaphragm develops, although you can't feel any activity even so.
Your babe is the size of a fig.
Read nigh your pregnancy at 11 weeks.
This calendar week your infant's reflexes kick in: Their fingers volition soon begin to open and close, toes volition curl, and their mouth will brand sucking movements, although you won't feel their movements quite nevertheless.
Your baby is the size of a lime.
Read near your pregnancy at 12 weeks.
This is the terminal week of your first trimester. Your baby'southward tiny fingers at present have fingerprints, and their veins and organs are clearly visible through their peel. If yous're having a girl, her ovaries comprise more than than 2 million eggs.
Your baby is the size of a pea pod.
Read about your pregnancy at 13 weeks.
In this illustration, you lot tin see how big – and yet, how tiny still – your babe is as 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 you're feeling more than energetic now and haven't been exercising, it'due south a skillful time to start a regular pregnancy fitness routine.
Plus: Encounter our ultimate pregnancy to-do listing for the 2d trimester
Your baby's brain impulses take begun to burn and they're using their facial muscles. Their kidneys are working at present, too. If yous have an ultrasound, yous may fifty-fifty see them sucking their thumb.
Your baby is the size of a lemon.
Read near your pregnancy at 14 weeks.
Your infant's eyelids are still fused close, but they can sense low-cal. If you shine 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 fifteen weeks.
The patterning on your baby'due south scalp has begun, though their hair isn't visible however. Their legs are more developed, their head is more than upright, and their ears are shut to their final position.
Your infant is the size of an avocado.
Read near your pregnancy at 16 weeks.
Your babe tin move their joints, and their skeleton – formerly soft cartilage – is now hardening to bone. The umbilical cord 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 you may be able to experience those movements. Internally, a protective blanket of myelin is forming effectually their nerves.
Your baby is the size of a bell pepper.
Read about your pregnancy at 18 weeks.
Your baby'southward senses – smell, vision, bear upon, taste and hearing – are developing and they may be able to hear your vox. Talk, sing or read out loud to them, if you lot feel like information technology.
Your infant is the size of an heirloom tomato.
Read virtually your pregnancy at xix weeks.
Your infant tin can swallow now and their digestive system is producing meconium, the dark, 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 well-nigh your pregnancy at xx weeks.
Your baby'south movements take gone from flutters to full-on kicks and jabs confronting the walls of your womb. You may outset to notice patterns every bit you become more familiar with their activity.
Your babe is the size of a carrot.
Read most your pregnancy at 21 weeks.
Your baby at present looks most like a miniature newborn. Features such equally lips and eyebrows are more singled-out, but the pigment that will color their eyes isn't nowadays all the same.
Your baby is the size of a spaghetti squash.
Read nigh your pregnancy at 22 weeks.
Your baby'southward ears are getting better at picking up sounds. After birth, 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, but chubbier times are coming. Their pare is still thin and translucent, only that will begin to change soon too.
Your baby 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 up out with baby fat, making them look more like a newborn. Their hair is beginning to come in, and it has colour and texture.
Your baby is now the same weight equally an boilerplate 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 practice for that first breath of air at nascence.
Your baby is the size of a agglomeration of scallions.
Read about your pregnancy at 26 weeks.
This is the last calendar week of your second 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 role outside the womb with medical help.
Your babe is the size of a caput of cauliflower.
Read about your pregnancy at 27 weeks.
In this illustration, you'll find 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 as they press on fretfulness in your hips and back.
At present's the time to do things like sign up for a childbirth class, choose a md for your babe, and create a baby registry, if you haven't done and then already.
Your babe's eyesight is developing, which may enable them to sense light filtering in from the outside. They can blink, and their eyelashes accept grown in.
Your baby is the size of a large eggplant.
Read most your pregnancy at 28 weeks.
Your baby'southward muscles and lungs are busy getting set up to function in the outside world, and their head is growing to make room for their developing brain.
Your babe is the size of a butternut squash.
Read about your pregnancy at 29 weeks.
Your baby is surrounded by a pint and a half of amniotic fluid, although in that location will be less of it as they grow and merits more space inside your uterus.
Your baby is the size of a large cabbage.
Read about your pregnancy at 30 weeks.
Your infant can now turn their head from side to side. A protective layer of fat is accumulating under their skin, filling out their arms and legs.
Your infant is the size of a kokosnoot.
Read virtually your pregnancy at 31 weeks.
You're probably gaining well-nigh a pound a week now. Half of that goes straight to your baby, who will proceeds one-third to one-half their nativity weight in the side by side seven weeks in training for life outside the womb.
Your baby is the size of a large jicama.
Read almost your pregnancy at 32 weeks.
The bones in your baby's skull aren't fused yet. That allows them to shift as their head squeezes through the birth canal. They won't fully fuse until machismo.
Your babe is the size of a pineapple.
Read about your pregnancy at 33 weeks.
Your babe'south central nervous system is maturing, every bit are their lungs. Babies born between 34 and 37 weeks who accept no other health issues normally do well in the long run.
Your baby is the size of a cantaloupe.
Read about your pregnancy at 34 weeks.
Information technology'southward getting snug inside your womb! Your baby'due south kidneys are fully developed, and their liver can procedure some waste products.
Your baby is the size of a honeydew melon.
Read nigh your pregnancy at 35 weeks.
Your baby is gaining near an ounce a twenty-four hours. They're also losing most of their lanugo hair that covered their torso, along with the vernix caseosa, a waxy substance that was protecting their pare until now.
Your baby is the size of a head of romaine lettuce.
Read virtually your pregnancy at 36 weeks.
Your due date is very close, and though your babe looks like a newborn, your babe is now considered at term. Over the next two 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 most your pregnancy at 37 weeks.
Are you curious about your baby's eye color? Their irises are not fully pigmented, and then if they're born with bluish optics, they could change to a darker color upwardly until they're about a year onetime.
Your baby is the size of a leek.
Read about your pregnancy at 38 weeks.
At 39 weeks, your baby will be considered full-term. In the analogy, you can encounter the fungus plug sealing your uterus and how squished your intestines are now.
Your baby's physical evolution is complete, but they're notwithstanding decorated 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 equally late as yous recollect, especially if you calculated information technology solely based on the day of your final period. Sometimes women ovulate afterward than expected.
Your provider will continuously assess your pregnancy to brand sure you can safely continue your pregnancy.
Your baby is the size of a pocket-size pumpkin.
Read about your pregnancy at 40 weeks.
Your baby is now considered late-term. Going more than two weeks past your due date can put you and your baby at take a chance for complications, so your provider volition probably talk to you well-nigh inducing labor. They may perform a Fetal Non-Stress test to monitor your baby's fetal heart rate and your contractions to brand sure your baby isn't in whatsoever fetal distress.
Read nearly your pregnancy at 41 weeks.
Meeting your baby for the kickoff time is so exciting – but exactly what will atomic number 82 upward to that moment is unpredictable, and it'due south natural to experience nervous. Hither's some help equally you prepare for the large twenty-four hours. Observe out how you'll know you're in labor and what to expect from commitment, sympathize your childbirth choices, and more.
Larn the signs and stages of labor
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