Definition

The clear or slightly yellow fluid that surrounds and protects an unborn baby as it grows during pregnancy. Amniotic fluid cushions the baby and helps keep the temperature in the womb constant. It also helps the growing baby’s lungs, digestive system, and bones develop properly. Amniotic fluid contains some of the baby’s cells and other substances. Samples of amniotic fluid may be taken to check the health of the baby and to test for genetic changes that may be a sign of a genetic disease or condition. Amniotic fluid also may be used to learn the sex of the baby.