Footmuffs are safe for strollers. Since they are attached to the stroller, they are less likely to fall off or get stuck in the wheels as a blanket would. Some footmuffs designed for infants can be used in a car seat. The American Academy of Pediatrics (AAP) advises that these footmuffs or buntings not add any bulkiness behind your child or between their body and the car seat's harness.