A fetus can be exposed to a variety of harmful agents that may cause birth defects. these agents are referred to as

In fetus can be exposed to a variety of harmful agent that may cause birth defects. These agent are referred to as teratogens

Teratogen are agent or factor which causes malformation of the embryo. It cause abnormalities in the development of the fetus, If the mother is exposed to it during pregnancy. Example of different type teratogen is certain chemical, medication and infection.