11.   Exposure may cause neurological damage in developing fetuses and infants.

12.   Folic acid helps ward off neural tube defects, such as spina bifida, in the developing fetus.

13.   For us, oxygen is a benign gas essential to life, but for a developing fetus it can be a killer.

14.   If a pregnancy has already occurred, emergency contraception will not end it and will not harm the developing fetus.

15.   In a developing fetus, a polycystic kidney can grow so large that it squeezes out the heart and lungs.

16.   In women, untreated syphilis can cause severe birth defects, or kill a developing fetus.

17.   It must also be water-soluble, pleasant to use, harmless to the normal vaginal environment and have no adverse effects on reproduction or a developing fetus.

18.   Most people are familiar with ultrasound for its ability to reflect images of the developing fetus in a pregnant woman.

19.   Mercury is extremely dangerous to the nervous system and exposure to high levels can permanently damage the brain, kidneys and a developing fetus.

20.   Morning sickness can actually be a good sign that these hormones are protecting the developing fetus, Erick says.