From formulation to labor, your baby is constantly growing and developing. Your baby moves through different stages, starting equally a blastocyst, and so maturing into an embryo, and then a fetus. Around the 5 week marking, your babe'south eye will begin to trounce, at 27 weeks they'll accept regular sleep and wake cycles, and at 39 weeks your baby is physically developed. Apply this timeline to learn how large your baby is, plus how they're developing throughout pregnancy.
Follow your baby'due south evolution calendar week past week, from conception to labor, in these amazingly detailed, doctor-reviewed images.
At the commencement of this week, yous ovulate. Your egg is fertilized 12 to 24 hours later if a sperm penetrates it. Over the adjacent 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 near fertilization.
Now nestled in the food-rich lining of your uterus is a microscopic ball of hundreds of chop-chop 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 brawl of cells is now officially an embryo. You're at present about iv weeks from the offset of your final menstruation. It's around this time – when your side by side menses would normally exist due – that you lot 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 four weeks.
Your babe resembles a tadpole more than a human, but is growing fast. The circulatory system is beginning to form, and the tiny "heart" will commencement to shell this week.
Your baby is the size of a sesame seed.
Read about your pregnancy at five weeks.
Your babe'southward nose, mouth and ears are starting to take shape, and their intestines and brain are showtime to develop.
Your baby is the size of a lentil.
Read about your pregnancy at six weeks.
Your baby has doubled in size since last week, just still has a tail, which will shortly disappear. Little easily and feet that await 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 lot won't experience movement notwithstanding. Nerve cells are branching out, forming primitive neural pathways. Animate tubes now 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's bones anatomy is developing (they even have tiny earlobes now), just there'due south much more to come up. Their embryonic tail has disappeared and they weigh merely a fraction of an ounce but are almost 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, but their tiny limbs can bend and fine details like nails are starting to form.
Your baby is the size of a kumquat
Read virtually your pregnancy at 10 weeks.
Your baby is almost fully formed. They're kicking, stretching, and even hiccupping as their diaphragm develops, although you tin't feel whatsoever activity yet.
Your baby is the size of a fig.
Read nigh your pregnancy at 11 weeks.
This week your baby's reflexes kick in: Their fingers will soon begin to open and close, toes will curl, and their mouth volition make sucking movements, although you lot won't feel their movements quite yet.
Your baby is the size of a lime.
Read about your pregnancy at 12 weeks.
This is the last week of your first trimester. Your babe's tiny fingers at present take fingerprints, and their veins and organs are clearly visible through their skin. If y'all're having a girl, her ovaries contain more ii million eggs.
Your baby is the size of a pea pod.
Read most your pregnancy at 13 weeks.
In this illustration, you lot can see how big – and yet, how tiny all the same – your babe is every bit you brainstorm your 2d trimester.
Later the first trimester, a miscarriage is much less probable. And for many moms-to-be, early pregnancy symptoms similar morning sickness and fatigue have faded away. If y'all're feeling more energetic now and haven't been exercising, it's a adept fourth dimension to kickoff a regular pregnancy fitness routine.
Plus: See our ultimate pregnancy to-exercise listing for the 2nd trimester
Your babe's brain impulses accept begun to fire and they're using their facial muscles. Their kidneys are working now, too. If you have an ultrasound, you lot may even run into them sucking their thumb.
Your babe is the size of a lemon.
Read about your pregnancy at 14 weeks.
Your baby's eyelids are still fused shut, only they can sense light. If you smooth a flashlight on your tummy, they'll motility abroad from the beam. Ultrasounds done this week may reveal your infant'due south sex.
Your babe is the size of an apple tree.
Read about your pregnancy at 15 weeks.
The patterning on your baby's scalp has begun, though their pilus isn't visible yet. Their legs are more developed, their caput is more than upright, and their ears are shut to their final position.
Your baby is the size of an avocado.
Read well-nigh your pregnancy at 16 weeks.
Your baby can movement 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 nearly 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 baby is the size of a bell pepper.
Read nigh your pregnancy at eighteen weeks.
Your baby's senses – smell, vision, impact, 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 experience like information technology.
Your baby is the size of an heirloom tomato.
Read about your pregnancy at 19 weeks.
Your baby can consume now and their digestive system is producing meconium, the dark, sticky goo that they'll pass in their first poop – either in their diaper or in the womb during delivery.
Your baby is the size of a banana.
Read almost your pregnancy at 20 weeks.
Your babe'due south movements accept gone from flutters to full-on kicks and jabs against the walls of your womb. You may offset to notice patterns as you get more than familiar with their activity.
Your baby is the size of a carrot.
Read about your pregnancy at 21 weeks.
Your infant now looks about like a miniature newborn. Features such equally lips and eyebrows are more than distinct, but the pigment that will color their eyes isn't present even so.
Your baby is the size of a spaghetti squash.
Read almost your pregnancy at 22 weeks.
Your babe's ears are getting better at picking upwardly sounds. After birth, they may recognize some noises outside the womb that they're hearing within now.
Your baby is the size of a large mango.
Read nigh your pregnancy at 23 weeks.
Your infant cuts a pretty long and lean figure, but chubbier times are coming. Their skin is however sparse and translucent, but that volition begin to change soon also.
Your baby is the size of an ear of corn.
Read about your pregnancy at 24 weeks.
Your baby's wrinkled skin is starting to fill out with baby fat, making them look more than similar a newborn. Their hair is offset to come in, and it has color and texture.
Your baby is now the same weight equally an average 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 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 final 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 assist.
Your baby is the size of a caput of cauliflower.
Read nearly your pregnancy at 27 weeks.
In this analogy, you'll observe that your growing baby takes upwards quite a bit of room these days. In the third trimester, you might be peeing more frequently or have leg cramps every bit they press on nerves in your hips and back.
Now'south the fourth dimension to do things similar sign upwards for a childbirth grade, choose a physician for your baby, and create a baby registry, if you oasis't done so already.
Your baby's eyesight is developing, which may enable them to sense low-cal filtering in from the outside. They can blink, and their eyelashes have grown in.
Your babe is the size of a big eggplant.
Read about your pregnancy at 28 weeks.
Your baby'south muscles and lungs are busy getting ready to function in the outside 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 by a pint and a half of amniotic fluid, although there will exist less of information technology equally they grow and claim more infinite inside your uterus.
Your babe is the size of a large cabbage.
Read about your pregnancy at 30 weeks.
Your baby can at present turn their caput from side to side. A protective layer of fat is accumulating under their skin, filling out their artillery and legs.
Your baby is the size of a kokosnoot.
Read about your pregnancy at 31 weeks.
You're probably gaining nearly a pound a calendar week at present. One-half of that goes straight to your babe, who will proceeds one-third to half their nativity weight in the next seven weeks in grooming for life outside the womb.
Your babe is the size of a large jicama.
Read almost your pregnancy at 32 weeks.
The basic in your baby's 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 infant's primal nervous organization is maturing, as are their lungs. Babies born between 34 and 37 weeks who have no other health problems usually practise well in the long run.
Your baby is the size of a cantaloupe.
Read about your pregnancy at 34 weeks.
It's getting snug inside your womb! Your infant'due south kidneys are fully developed, and their liver tin process some waste product 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 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 babe 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 similar a newborn, your babe is now considered at term. Over the next two weeks their lungs and encephalon will continue to mature. Yous tin go into labor any day now.
Your baby is the size of a bunch of Swiss chard.
Read near your pregnancy at 37 weeks.
Are you lot curious near your infant's eye colour? Their irises are not fully pigmented, and so if they're born with bluish eyes, they could alter to a darker color upwardly until they're near a year onetime.
Your baby is the size of a leek.
Read almost your pregnancy at 38 weeks.
At 39 weeks, your infant will be considered full-term. In the illustration, you can see the mucus plug sealing your uterus and how squished your intestines are now.
Your baby'southward physical development is complete, but they're still busy 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 date, you may not be every bit late as yous think, especially if you calculated it solely based on the day of your concluding flow. Sometimes women ovulate later than expected.
Your provider will continuously assess your pregnancy to brand sure you lot can safely continue your pregnancy.
Your baby is the size of a small pumpkin.
Read most your pregnancy at twoscore weeks.
Your baby is now considered late-term. Going more than than two weeks past your due date can put you and your infant at risk for complications, so your provider volition probably talk to you about inducing labor. They may perform a Fetal Non-Stress test to monitor your infant'south fetal heart rate and your contractions to make sure your infant isn't in whatever fetal distress.
Read nigh your pregnancy at 41 weeks.
Coming together your baby for the first time is so exciting – but exactly what will atomic number 82 upward to that moment is unpredictable, and it's natural to feel nervous. Here's some help every bit yous prepare for the big day. Detect out how yous'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
Watch live nascence videos
Take our free childbirth class
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