Finally,
you're pregnant! Sperm and egg have officially merged into one single
cell, called a zygote. Inside that cell, a lot is going on. Chromosomes
from you and your partner are combining to decide your baby's gender,
hair, and eye color — even his or her budding personality! 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. It will
surround and protect your baby while he or she grows. Attached to it
will be the yolk sac, which will feed baby in these early weeks. Your
baby may be big enough to see on ultrasound now, but just barely. He or
she is smaller than a grain of rice.
WEEK 5
You
still might not recognize your baby yet. At this stage, he or she looks
like a tiny collection of tubes. But those tubes have important
purposes! One tube is forming a brain and spinal cord. Another is
developing into baby's heart. Tiny buds on either side of the body will
grow into arms and legs. 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
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