Harmful chemicals or viruses that can be transferred from a mother to her developing fetus are called

Teratogens are harmful chemicals or viruses that can be transferred from a pregnant mother to her developing fetus when exposed to teratogens which affect pregnancies and cause complications such as preterm labor, spontaneous abortion or miscarriages. Example of teratogen chemicals or viruses are; alcohol, tobacco smoke, mercury, lead, air pollution, pesticides, and drugs used during pregnancy. These toxicants cause low birth weight, paralysis, anemia, heart and lung problems to infants.

Tetratogens

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.