Pregnancy Week 13
From week 13 until birth, your growing baby is called a fetus.
Only two months ago your baby was just a ball of cells.
Now your baby has functioning organs, muscles and nerves.
In the thirteenth week, the intestines move from the umbilical cord into the baby's abdomen.
Your baby also begins to form urine which is discharged into the amniotic fluid.
Lanugo, a fine, down-like hair that will protect your baby's developing skin, and will eventually cover your baby's whole body, begins to form on your baby's face.
Your first trimester symptoms should continue to abate.
Unfortunately they may be replaced by some second trimester ones including back pain, ankle swelling, sensitive nipples, stretch marks, dizziness, leg cramps and a thin whitish vaginal discharge called leukorrhea.
From now on, you may also expect to gain up to 4 pounds or 2 kilograms per month until the end of your pregnancy.