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TRIMESTER 1
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Week 1
This is week one of your pregnancy, but you're not officially pregnant yet. Your uterus is thickening so it can house and feed your fertilized egg once it implants. -
Week 2
you're at the most fertile time of the month — you're ovulating! If a sperm makes its way to a waiting egg in your fallopian tube, you're going to conceive. -
Week 3
you're pregnant! Sperm and egg have officially merged into one single cell, called a zygote. As the zygote speeds down the fallopian tubes toward the uterus, it will keep dividing. Two cells will become four, four will become eight, and so on. These cells will eventually create every organ in your baby's body. -
Week 4.
Now that the embryo has attached to the wall of your uterus, the real work begins. Cells are dividing that will create all of your baby's organs. A fluid-filled cushion called the amniotic sac is forming. Attached to it will be the yolk sac, which will feed baby in these early weeks. He or she is smaller than a grain of rice. -
Week 5
At this stage, he or she looks like a tiny collection of tubes. Another is developing into baby's heart. As your baby keeps growing, you might feel the first twinges of pregnancy symptoms, such as sore breasts, morning sickness, and the constant urge to urinate. -
Week 6
your baby's tiny heart has started to beat. That heart sits inside a body that's now almost 1/2-inch long from the top of the head to the rump Human features are starting to emerge, including two eyes that come complete with lids. The lungs and digestive system are also starting to branch out, forming the organs that will help your baby breathe and eat in just a few months. -
Week 7
your baby's body is already forming every organ it will need — including the heart, kidneys, liver, lungs, and intestines. Your baby is attached to you by an umbilical cord. Through this connection, you'll provide food, and filter away your baby's wastes until you deliver. -
Week 8
Inside your uterus, your baby is developing at a rapid pace. In fact, he or she has officially graduated from embryo to fetus! -
Week 9
Your baby weighs about 1/8 of an ounce Your baby's head is still huge compared to the body, but it will get more proportional in the weeks to come. Inside, the reproductive organs are forming -
Week 10
Your baby now has a real profile with well-defined eyes, mouth, and ears. Baby's eyes are wide open now, but soon the eyelids will close. Inside baby's brain, the connections are forming. -
Week 10
Your baby now has a real profile with well-defined eyes, mouth, and ears. Baby's eyes are wide open now, but soon the eyelids will close. Inside baby's brain, the connections are forming. -
Week 11
Baby still only measures just 2 inches long from the top of the head to the rump. Most of that is the head, which makes up about half of your baby's entire body! Your baby is growing fingernails and irises. -
Week 12
By now you've put on 2 to 5 pounds, and your baby looks like a fully formed person. Inside, more organs are developing. Your little one also has teeth, as well as fingers and toes. -
Week 13
Now, you should be putting on weight. Your baby is growing quickly now and is getting more proportional. now the head makes up only 1/3 of your baby's body. Helping your baby grow is the placenta, which is serving up a steady supply of nutrients and disposing of wastes. If you're having a girl, her ovaries are already filled with hundreds of thousands of eggs.