Weighting for baby

Elena Nieves hardly looks like a poster girl for an obesity program for pregnant moms. The 1.7-m 23-year-old recently lost more than 23 kg and is now a picture of health but 15 weeks into her third pregnancy, she was gaining the weight - too fast.

"I found out I was pregnant in December. I didn't go to the doctor until mid-January and I had already gained 7 kg," she says. Having struggled with her weight during a previous pregnancy, she decided to take action.

Nieves became the newest member of an experimental program at Northwestern Memorial Hospital in Chicago designed to help pregnant mothers keep their weight in check.