Folic acid supplements are also recommended by most doctors. Other supplements for vitamins and minerals may also be helpful. Talk to your doctor about your need for these supplements. Because certain vitamins may harm your baby if taken in large amounts, do not take vitamin supplements without your doctor's advice. Two substances that are known to harm unborn children are tobacco and alcohol.
Babies born to mothers who smoke are likely to be smaller than normal.
If you drink often or drink large amounts of alcohol, it can even cause your baby to be mentally retarded. You should not take any drug while you are pregnant that isn't prescribed by your doctor, and the doctor must know you are pregnant. Any drug you take, your baby also takes. Let your doctor guide you on the use of all drugs while you are pregnant. Be sure to tell any doctor who prescribes medication for you that you are now pregnant.