Pregnancy Week by Week

The 20th Week of Pregnancy

At this point in your pregnancy, your baby measures about 5.6 to 6.4 inches and weighs about 9 ounces. By the time you are 20 weeks pregnant, your baby is starting to grow hair on his or her head! Additional fetal developments taking place include the following:
  • A protective, waxy skin covering (called vernix caseosa) forms to protect the baby's skin from the amniotic fluid
  • Eyebrows are forming
  • Your baby's skin is thickening and developing layers, including the dermis, epidermis, and subcutaneous layer.
During week 20 of pregnancy, you may notice a darkening of the line between your belly button and pubic area (linea nigra). It will fade after delivery. You may also experience:
  • Vaginal discharge
  • Changes in complexion
  • Changes in skin texture
  • Changes in the appearance of your navel.
(Click 20 Weeks Pregnant for more information.)

Pregnancy Week 21

Congratulations! You are about halfway through your pregnancy. Your baby is now 7.2 inches long, and his or her tissues and organs continue to mature. Other developments taking place in your baby around week 21 of pregnancy include the following:
  • The heart grows stronger, and the legs reach their relative proportions
  • Vernix caseosa -- a protective skin covering -- is still being produced by your baby's oil glands
  • Buds for permanent teeth are beginning to form.
During this week of your pregnancy:
  • Your uterus is now about half an inch above your belly button
  • You may have gained 10 to 15 pounds since your pre-pregnancy weight
  • Your ankles and feet may be swelling.
Exercises such as swimming, walking, and yoga are a great way to stay in shape during pregnancy, and may help alleviate some of your symptoms. Be sure to check with your healthcare provider before starting any exercise program.
(Click 21 Weeks Pregnant for more information.)
Pregnancy and Pain

Week by Week Pregnancy

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