Newborns aren't supposed to be in a car seat for more than 2 hours at a time. But at what age is it OK for them to spend longer in the car? And how long is OK as they get older?
DS is 21 months and we are arguing about whether it's OK to let him sleep in the car for 4 hours.
Google bangs on and on about newborns and the 2 hour rule but I can't find guidelines for older babies and toddlers.
Can anyone point me to any "official" advice? Thanks!