From conception to labor, your babe is constantly growing and developing. Your baby moves through different stages, starting equally a blastocyst, then maturing into an embryo, and and so a fetus. Around the 5 calendar week marking, your infant's center volition begin to crush, at 27 weeks they'll accept regular slumber and wake cycles, and at 39 weeks your baby is physically developed. Use this timeline to learn how large your baby is, plus how they're developing throughout pregnancy.
Follow your baby'south development week by week, from formulation to labor, in these amazingly detailed, doctor-reviewed images.
At the start of this week, y'all ovulate. Your egg is fertilized 12 to 24 hours later if a sperm penetrates it. Over the next several days, the fertilized egg will start dividing into multiple cells as it travels downward the fallopian tube, enters your uterus, and starts to couch 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 speedily 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 about implantation.
Your ball of cells is now officially an embryo. Yous're now about 4 weeks from the get-go of your last flow. It's around this fourth dimension – when your next period would normally be due – that you might exist able to get a positive upshot on a home pregnancy test.
Your infant is the size of a poppy seed.
Read about your pregnancy at 4 weeks.
Your baby resembles a tadpole more than a homo, only is growing fast. The circulatory system is outset to class, and the tiny "heart" will start to beat out this week.
Your baby is the size of a sesame seed.
Read about your pregnancy at 5 weeks.
Your baby's nose, oral cavity and ears are starting to take shape, and their intestines and brain are beginning to develop.
Your babe is the size of a lentil.
Read about your pregnancy at six weeks.
Your babe has doubled in size since last week, but still has a tail, which will soon disappear. Petty hands and anxiety 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 infant has started moving around, though yous won't experience movement notwithstanding. Nerve cells are branching out, forming primitive neural pathways. Breathing tubes now extend from their pharynx to their developing lungs.
Your baby is the size of a kidney bean.
Read near your pregnancy at 8 weeks.
Your baby's basic anatomy is developing (they even have tiny earlobes at present), just there'southward much more than to come. Their embryonic tail has disappeared and they weigh just a fraction of an ounce but are nigh to get-go 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 still translucent, but their tiny limbs can curve and fine details similar nails are starting to grade.
Your baby is the size of a kumquat
Read almost your pregnancy at ten weeks.
Your baby is virtually fully formed. They're boot, stretching, and fifty-fifty hiccupping as their diaphragm develops, although yous tin't experience whatsoever action nonetheless.
Your baby is the size of a fig.
Read nearly your pregnancy at 11 weeks.
This week your baby's reflexes boot in: Their fingers will shortly begin to open and shut, toes will roll, and their mouth will brand sucking movements, although yous won't feel their movements quite withal.
Your babe is the size of a lime.
Read well-nigh your pregnancy at 12 weeks.
This is the last calendar week of your starting time trimester. Your baby's tiny fingers now accept fingerprints, and their veins and organs are clearly visible through their skin. If you lot're having a girl, her ovaries contain more than than 2 meg eggs.
Your baby is the size of a pea pod.
Read nigh your pregnancy at 13 weeks.
In this illustration, you can see how big – and yet, how tiny still – your baby is as you begin your second trimester.
After the kickoff trimester, a miscarriage is much less likely. And for many moms-to-be, early pregnancy symptoms like forenoon sickness and fatigue take faded away. If y'all're feeling more energetic now and haven't been exercising, it'southward a expert time to first a regular pregnancy fitness routine.
Plus: Run into our ultimate pregnancy to-practice list for the second trimester
Your baby'south brain impulses have begun to burn and they're using their facial muscles. Their kidneys are working now, too. If you lot take an ultrasound, you may even meet them sucking their pollex.
Your baby is the size of a lemon.
Read about your pregnancy at fourteen weeks.
Your babe'due south eyelids are notwithstanding fused shut, but they can sense light. If y'all smooth a flashlight on your tummy, they'll move away from the beam. Ultrasounds washed this week may reveal your baby'southward sex.
Your baby is the size of an apple.
Read well-nigh your pregnancy at 15 weeks.
The patterning on your baby'due south scalp has begun, though their hair isn't visible notwithstanding. 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 most your pregnancy at 16 weeks.
Your babe can 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 nigh your pregnancy at 17 weeks.
Your baby is flexing their artillery and legs, and you lot may exist 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 most your pregnancy at xviii weeks.
Your infant's senses – smell, vision, touch, gustatory modality and hearing – are developing and they may exist able to hear your voice. Talk, sing or read out loud to them, if you feel like information technology.
Your baby is the size of an heirloom tomato.
Read about your pregnancy at 19 weeks.
Your infant tin can swallow now and their digestive system is producing meconium, the dark, sticky goo that they'll pass in their beginning 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's movements have gone from flutters to full-on kicks and jabs confronting the walls of your womb. Yous may outset to notice patterns equally you go more familiar with their activity.
Your baby is the size of a carrot.
Read about your pregnancy at 21 weeks.
Your baby at present looks almost similar a miniature newborn. Features such as lips and eyebrows are more than distinct, but the paint that volition colour their eyes isn't present yet.
Your baby is the size of a spaghetti squash.
Read near your pregnancy at 22 weeks.
Your infant's ears are getting better at picking up sounds. Later birth, they may recognize some noises outside the womb that they're hearing inside now.
Your babe is the size of a large mango.
Read about your pregnancy at 23 weeks.
Your baby cuts a pretty long and lean figure, merely chubbier times are coming. Their skin is still thin and translucent, but that will begin to change soon too.
Your baby is the size of an ear of corn.
Read well-nigh your pregnancy at 24 weeks.
Your infant's wrinkled pare 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 aforementioned weight as an boilerplate rutabaga.
Read about your pregnancy at 25 weeks.
Your baby is at present inhaling and exhaling amniotic fluid, which helps develop their lungs. These breathing movements are good exercise for that offset 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 terminal week of your second trimester. Your infant now sleeps and wakes on a regular schedule, and their brain is very active. Their lungs aren't fully formed, simply they could function outside the womb with medical help.
Your baby is the size of a head of cauliflower.
Read well-nigh your pregnancy at 27 weeks.
In this analogy, you lot'll find that your growing baby takes up quite a scrap of room these days. In the third trimester, y'all might exist peeing more often or have leg cramps every bit they printing on nerves in your hips and back.
Now's the time to do things like sign up for a childbirth form, cull a doctor for your babe, and create a babe registry, if you haven't done so already.
Your babe's eyesight is developing, which may enable them to sense light filtering in from the exterior. They tin can glimmer, and their eyelashes have grown in.
Your baby is the size of a large eggplant.
Read nearly your pregnancy at 28 weeks.
Your baby's muscles and lungs are busy getting ready to function in the exterior world, 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 baby is surrounded past a pint and a one-half of amniotic fluid, although there volition be less of it as they grow and merits more than space inside your uterus.
Your infant is the size of a large cabbage.
Read about your pregnancy at 30 weeks.
Your babe can at present 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 nigh a pound a week now. Half of that goes straight to your baby, who will gain one-third to half their nascence weight in the next 7 weeks in preparation for life exterior the womb.
Your infant is the size of a large jicama.
Read about your pregnancy at 32 weeks.
The bones in your baby'south skull aren't fused yet. That allows them to shift as their head squeezes through the birth canal. They won't fully fuse until adulthood.
Your baby is the size of a pineapple.
Read about your pregnancy at 33 weeks.
Your infant's central nervous organisation is maturing, equally are their lungs. Babies born between 34 and 37 weeks who take no other wellness problems ordinarily do well in the long run.
Your baby is the size of a cantaloupe.
Read nearly 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 products.
Your baby is the size of a honeydew melon.
Read about your pregnancy at 35 weeks.
Your baby is gaining nearly an ounce a solar day. They're besides 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 caput of romaine lettuce.
Read about your pregnancy at 36 weeks.
Your due appointment is very close, and though your infant looks like a newborn, your baby is at present considered at term. Over the next ii weeks their lungs and encephalon will continue to mature. You tin get 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 curious almost your baby's heart color? Their irises are non fully pigmented, so if they're born with bluish optics, they could change to a darker color upwards until they're well-nigh a year old.
Your baby is the size of a leek.
Read about your pregnancy at 38 weeks.
At 39 weeks, your infant will be considered full-term. In the illustration, yous can see the mucus plug sealing your uterus and how squished your intestines are at present.
Your babe'south physical development is complete, but they're yet decorated putting on fat and growing bigger.
Your baby is the size of a mini watermelon.
Read nearly your pregnancy at 39 weeks.
If you're by your due date, yous may not be as tardily equally yous think, especially if you calculated it solely based on the day of your concluding catamenia. Sometimes women ovulate later than expected.
Your provider will continuously assess your pregnancy to make certain you tin safely continue your pregnancy.
Your baby is the size of a modest pumpkin.
Read about your pregnancy at 40 weeks.
Your baby is now considered late-term. Going more than than two weeks past your due date can put yous and your infant at take a chance for complications, so your provider will probably talk to you about inducing labor. They may perform a Fetal Non-Stress test to monitor your baby's fetal heart rate and your contractions to make sure your baby isn't in whatever fetal distress.
Read well-nigh your pregnancy at 41 weeks.
Meeting your babe for the starting time time is then heady – but exactly what will atomic number 82 upward to that moment is unpredictable, and it'south natural to feel nervous. Here'south some help as you lot prepare for the big day. Find out how y'all'll know you're in labor and what to expect from delivery, sympathize your childbirth choices, and more than.
Learn the signs and stages of labor
Watch alive birth videos
Have our costless childbirth grade
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