SEATTLE (AP) — Parents who thought their preschoolers were spending time in home-based day cares, taking naps, eating healthy snacks and learning to play nicely with others may be surprised to discover they are sitting as many as two hours a day in front of a TV, according to a study published Monday.

When added to the two to three hours many parents already admit to allowing at home, preschoolers in child care may be spending more than a third of the about 12 hours they are awake each day in front of the electronic baby sitter, said Dr. Dimitri Christakis, a pediatrician at Childr...