When a woman becomes pregnant, her health affects her and her baby both. Being overweight or obese can also play a part in how a woman's pregnancy goes.

Being overweight while pregnant can increase several health risks. But after you have your baby, it's not too late to try to lose the pounds if you want to have another.

Smoking is a known health hazard for pregnancies. But being exposed to smoke in utero may follow a baby girl into her own pregnancy when she grows up.

One of the most important nutrients for pregnant women to get while carrying a baby is folic acid. Health officials already knew it was good for babies' brains, but it may help their hearts too.

Though extra body weight comes with its own set of health concerns, having a few extra pounds might be helpful in protecting a woman's uterus. 

Dangerous weight loss as a result of an eating disorder can get in the way of a normal menstrual cycle. But when treatment works, girls gain weight and get their cycle back.

Gaining weight is a natural part of growing a baby in your womb. Being overweight or obese while you are pregnant, however, can carry additional risks for your pregnancy.

One recent study found that too little vitamin D didn't appear to affect baby's bone growth. But there are other risks if expecting moms have too little vitamin D.

Women are supposed to gain weight during a healthy pregnancy. But weighing too much at the start or gaining too much weight during pregnancy may increase certain risks.