Baby fat, as it turns out, is more dangerous than we thought. A new study carried out with 7,000 overweight children in kindergarten has discovered that a third of them were obese by the age of 13, risking a lifetime of heaviness. Researchers believe the link may go back as far as the womb but said the younger years are clearly influential in determining obesity and weight-related illnesses later in life. The study, published in The New England Journal of Medicine, pointed to the importance of healthy eating and exercise, urging parents to hide sodas and remotes. Parents: Be sure to tell kids that protesting healthy changes will do them a fat lot of good.