The UK government recommends that babies should not be kept in a car seat for more than two hours at a time. It is important to break up long car journeys and take regular breaks to allow your baby to stretch and move around. As a general rule, aim to take a break every two hours, and make sure to remove your baby from their car seat and allow them to move around. During these breaks, you can change your baby's nappy, feed them, or let them play. If possible, try to plan your journey around your baby's routine and nap times.