So it's pretty clear that smoking while pregnant is a bad idea. But what if it's just those around you who are smoking? Does that affect unborn babies too? Possibly.

It's challenging enough to raise headstrong toddlers. But toddlers and older kids whose mothers used cocaine during pregnancy? Their behavior can be especially difficult.

It's clear that heavy drinking while pregnant can harm a baby. But research has been less clear about whether only a few drinks makes a difference. Until now.

Most women know they are advised not to drink during pregnancy. They may not realize how much drinking while pregnant can deeply affect children's brains even years later.

Many factors influence individuals' weight. The same is true for children. Preventing obesity is easier when we know what factors increase a baby's risk of becoming overweight.

There are 101 reasons not to smoke while you're pregnant. But here is reason #102: there's some evidence it might change the way your child's brain works later on.

It's pretty well established that smoking while pregnant leads to various negative health effects for your child. But even being around cigarette smoke can affect your unborn baby.

Many studies have looked at differences in children whose mothers drank while pregnant compared to kids whose moms didn't. But what about differences before the babies are even born?

If you're thinking of lighting up while a little one kicks in your tummy, this might stop you. Do you want an overweight child?

A study on how ecstasy during pregnancy might affect babies at 4 months old was published early this year. Now those babies are a year old. They're still developing slowly.