You've probably heard every old wives' tale while you are Pregnant. "Don't do this, don't do that." Here are some warnings worth heeding:

* Don't smoke. Smoking raises your risk for miscarriage, premature birth, low birth weight and many other problems.

* Don't use drugs. Cocaine, heroin, marijuana and other drugs increase your risk of miscarriage, premature birth and birth defects. Your baby could also be born addicted to the drug you've been abusing, which can cause serious health problems.

* Don't drink alcohol. Drinking alcohol during pregnancy is the major cause of preventible birth defects, including fetal alcohol syndrome.

* Don't clean your cat's litter box or eat raw or undercooked red meat. You could get toxoplasmosis, a disease that can cause birth defects.

* Don't sit in a sauna or hot tub. The high heat raises your risk of miscarriage and birth defects.

* Don't douche. Douching could force air into the vagina, which can cause an air embolism. The vagina doesn't require cleansing in addition to normal bathing. Douching disrupts the helpful bacteria that keep the vagina clean.