how long can a baby be in a car seat

A baby can safely be in a car seat for up to 2 hours at a time, which is known as the "2-hour rule." For newborns under 4 weeks old, it is recommended to avoid using a car seat for longer than 30 minutes at a time due to their weak neck muscles and risk of breathing difficulties. For babies older than 4 months, the 2-hour rule generally applies until they can sit up unassisted and have full head and neck control. On longer journeys, it is advised to take regular breaks every 1.5 to 2 hours to remove the baby from the car seat, allowing them to stretch and change positions safely. Babies should never sleep overnight in their car seat. This guidance applies whether in a car or if the car seat is used as part of a travel system with a stroller.