test allows your doctor to see an image of your developing baby. It is often
done at 18 to 20 weeks of pregnancy. Doctors can use ultrasound to look for
certain features that are related to some problems, such as Down
syndrome. The test also can be used to find problems of the
heart, spine, belly, or other areas.
Amniocentesis. Doctors use this test
to look for chromosomal problems in the baby's cells. A doctor puts a needle
through the belly and into the uterus to collect some of the amniotic fluid that surrounds the baby. This fluid contains some of the baby's cells. The test is
done between 15 and 20 weeks of pregnancy, usually around week 16.
This test also can help find neural tube defects, such as spina bifida.