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Week 1 and Week 2
During week 2 fertilization happens, a woman ovulate and the egg is fertilized withing 12 to 24 hours later if the sperm penetrates it. Over the next several days, the fertilized egg will start dividing into multiple cells as it travels down the Fallopian tube, enters your uterus, and starts to burrow into the uterine lining. -
Week 3
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, called a blastocyst, has begun to produce the pregnancy hormone hCG, which tells your ovaries to stop releasing eggs. -
Week 4 and Week 5
4th - Your ball of cells is now officially an embryo. You're now about 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 be able to get a positive result on a home pregnancy test. 5th - Your baby resembles a tadpole more than a human, but is growing fast. The circulatory system is beginning to form, and the tiny heart will start to beat this week. Your baby is the size of a sesame seed. -
Week 6 and week 7
During week 6: Your baby's nose, mouth and ears are starting to take shape, and the intestines and brain are beginning to develop.
Your baby is the size of a lentil. During week 7: Your baby has doubled in size since last week, but still has a tail, which will soon disappear. Little hands and feet that look more like paddles are emerging from the developing arms and legs.
Your baby is the size of a blueberry. -
Week 8 and Week 9
8- Your baby has started moving around, though you won't feel movement yet. Nerve cells are branching out, forming primitive neural pathways. Breathing tubes now extend from his throat to his developing lungs.
Your baby is the size of a kidney bean.
9- Your baby's basic physiology is in place she even has tiny earlobes. Her embryonic tail has disappeared. She weighs just a fraction of an ounce but is about to start gaining weight fast.
Your baby is the size of a grape. -
Week 10 and Week 11
10-Your embryo has completed the most critical portion of development. His skin is still translucent, but his tiny limbs can bend and fine details like nails are starting to form.
11- Your baby is almost fully formed. She's kicking, stretching, and even hiccuping as her diaphragm develops, although you can't feel any activity yet. -
Week 12 and Week 13
12- This week your baby's reflexes kick in: His fingers will soon begin to open and close, toes will curl, and his mouth will make sucking movements. He'll feel it if you gently poke your tummy – though you won't feel his movements yet.
Your baby is the size of a lime.
13-This is the last week of your first trimester. Your baby's tiny fingers now have fingerprints, and her veins and organs are clearly visible through her skin.
Your baby is the size of a pea pod. -
Week 14 and Week 15
14- Your baby's brain impulses have begun to fire and he's using his facial muscles. His kidneys are working now, too. If you have an ultrasound, you may even see him sucking his thumb.
Your baby is the size of a lemon.
15-15 weeks
Your baby's eyelids are still fused shut, but she can sense light. If you shine a flashlight on your tummy, she'll move away from the beam. Ultrasounds done this week may reveal your baby's sex.
Your baby is the size of an apple. -
Week 16 and Week 17
16- The patterning on your baby's scalp has begun, though the hair isn't visible yet. His legs are more developed – find out when you're likely to feel your baby kick! His head is more upright, and his ears are close to their final position.
Your baby is the size of an avocado.
17-Your baby can move her joints, and her 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. -
Week 18 and Week 19
18- Your baby is flexing his arms and legs, and you may be able to feel those movements. Internally, a protective coating of myelin is forming around his nerves.
Your baby is the size of a bell pepper.
19- 19 weeks
Your baby's senses – smell, vision, touch, taste and hearing – are developing and she may be able to hear your voice. Talk, sing or read out loud to her, if you feel like it.
Your baby is the size of an heirloom tomato. -
Week 20 and Week 21
20-Your baby can swallow now and his digestive system is producing meconium, the dark, sticky goo that he'll pass in his first poop – either in his diaper or in the womb during delivery.
Your baby is the size of a banana.
21-Your baby's movements have gone from flutters to full-on kicks and jabs against the walls of your womb. You may start to notice patterns as you become more familiar with her activity.
Your baby is the size of a carrot. -
Week 22 and Week 23 and Week 24
22-Your baby now looks almost like a miniature newborn. Features such as lips and eyebrows are more distinct, but the pigment that will color his eyes isn't present yet.
Your baby is the size of a spaghetti squash.
23-Your baby's ears are getting better at picking up sounds.
Your baby is the size of a large mango.
24-Your baby cuts a pretty long and lean figure.His skin is still thin and translucent, but that will begin to change soon too.
Your baby is the size of an ear of corn. -
Weeks 25,26,27
25-Your baby's wrinkled skin is starting to fill out with baby fat, making her look more like a newborn. Her hair is beginning to come in, and it has color and texture.
Your baby is now the same weight as an average rutabaga.
26-Your baby is now inhaling and exhaling amniotic fluid, which helps develop his lungs.
27-This is the last week of your second trimester. Your baby now sleeps and wakes on a regular schedule, and her brain is very active.The size is of a head of cauliflower. -
Week 28,29,30
28-Your baby's eyesight is developing, which may enable her to sense light filtering in from the outside. She can blink, and her eyelashes have grown in.
Your baby is the size of a large eggplant.
29-Your baby's muscles and lungs are busy getting ready to function, and his head is growing to make room for his developing brain.
Your baby is the size of a butternut squash.
30-Your baby is surrounded by a pint and a half of amniotic fluid,
Your baby is the size of a large cabbage. -
Week 31,32,33
31-Your baby can now turn his head from side to side. A protective layer of fat is accumulating under his skin, filling out his arms and legs.
Your baby is the size of a coconut.
32- You're probably gaining about a pound a week. Half of that goes straight to your baby, who will gain one-third to half her birth weight in the next seven weeks in preparation for life outside the womb.
Your baby is the size of a large jicama.
33-Your baby is the size of a pineapple. -
Week 34, 35, and 36
34-Your baby's central nervous system is maturing, as are her lungs.Your baby is the size of a cantaloupe.
35-It's getting snug inside your womb! Your baby's kidneys are fully developed, and his liver can process some waste products.
Your baby is the size of a honeydew melon.
36-Your baby is gaining about an ounce a day. She's also losing most of the fine down that covered her body, along with the vernix casosa,Your baby is the size of a head of romaine lettuce. -
Week 37, 38,
37-your baby looks like a newborn, he isn't quite ready for the outside world. Over the next two weeks his lungs and brain will fully mature.
Your baby is the size of a bunch of Swiss chard.
38- Her irises are not fully pigmented, so if she's born with blue eyes, they could change to a darker color up until she's about a year old.
Your baby is the size of a leek. -
Week 39
At 39 weeks, your baby will be considered full-term. In the illustration, you can see the mucus plug sealing your uterus and how squished your intestines are now. -
Week 40!
On your 40th week is usually when the baby is born!
Your baby is the size of a small pumpkin.
