Answer: B. At age 2. Experts used to advise doing the switcheroo around a child's first birthday, but recent research shows that children under 24 months are five times more likely to die or be seriously injured if they're in a front-facing seat. So just last year, the American Academy of Pediatrics (AAP) issued new recommendations. "A rear-facing car seat does a better job of supporting a young child's head and immature neck and spine because it distributes the force of a collision over the entire body," says Parents advisor Dennis Durbin, M.D., a pediatric emergency physician at the Children's Hospital of Philadelphia (CHOP). Worried about your toddler's scrunched-up legs? Don't be. There's no evidence that they're more likely to be injured in a rear-facing seat. Plus, it's much easier to fix a broken leg than a broken neck.