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Week 21

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Your Baby's Development

Pregnancy Calendar

The amniotic fluid that has cushioned and supported your baby in the uterus now serves another purpose. The intestines have developed enough that small amounts of sugars can be absorbed from the fluid that is swallowed and passed through the digestive system to the large bowel. Almost all of your baby's nourishment, however, still comes from you through the placenta.

Until now your baby's liver and spleen have been responsible for the production of blood cells. But now the bone marrow spaces are developed enough to contribute to blood cell formation as well, and bone marrow will become the major site of blood cell production in the third trimester and after birth. (The spleen will stop producing blood cells by week 30, and the liver will stop a few weeks before birth.)

Week 21

Your Body

Is exercise safe during pregnancy? Exercise can be a great way to stay in shape during pregnancy and can even keep some symptoms — such as varicose veins, excessive weight gain, and backache — to a minimum. But pregnancy is not the time to start training for a triathlon — going slowly is the name of the game. Because ligaments become more relaxed during pregnancy, you're at higher risk for injury, so low- or non-impact exercise such as yoga, swimming, and walking are your best bets. Talk to your health care provider before beginning any exercise program while you're pregnant.

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Note: All information is for educational purposes only. For specific medical advice, diagnoses and treatment, consult your doctor.

© 1995–2014 The Nemours Foundation/KidsHealth. All rights reserved.

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Spring 2014: Good Growing Newsletter

In This Issue

  • Cold Water Shock Can Quickly Cause Drowning
  • E-Cigs Are Addictive and Harmful
  • Bystanders Can Intervene to Stop Bullying

Download Spring 2014 (PDF)

Videos

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Children’s Mental Health 0:00:30Expand
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Mark Fadool, clinical director of mental health services at Odessa Brown Children's Clinic, provides early warning signs of mental health issues in kids and teens and urges us all to notice the signs and act early.

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