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?

It's a catch-22. If you find out your child has a heart defect before he's born, you can prepare. But it can also stress out mom — which can affect the baby as well.

Pregnant women need enough iodine for their baby's brain to develop well. But too much iodine can backfire by interrupting normal hormone production.

Everyone's got billions of little critters hanging out in their gut. They're helpful little critters — they aid the digestive and immune systems. But what you eat changes what they are.

To cut, or not to cut? That is literally the centuries-old question. The American Academy of Pediatrics ( AAP ) has wavered on their position regarding circumcision.

There's no cause for alarm or plans to buy diapers after Maria Sharapova's stomach ache during the gold medal match at the Olympic games. The pain during her loss against Serena Williams in the London finals was just from a stomach virus, not a stork visit.

Most people have heard that it can be more risky to have children after age 35. However, these concerns usually relate to birth complications and not to the children's development.

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.

Most people have known that smoking marijuana was not safe for pregnancy. Modern, high-potency marijuana poses additional dangers for fetal development.

Having a stillbirth can be one of the most devastating experiences that expectant parents could face. Sometimes it helps to understand the risk factors.