Most convertible seats in the U.S. have at least a rear-facing weight limit, most now to go to , some and a few . The American Academy of Pediatrics (AAP) recommends that children remain rear-facing until they outgrow their convertible seat, regardless of how old they are. Children can remain in a rear-facing seat until they have either outgrown the weight limit for their seat, or the top of their head is within of the top of the shell of the car seat.