My apologies, I thought we were talking about the 20 month old. Agreed snacks unsupervised not appropriate for the 7 month old. To be honest at that age I tried to avoid nap time, and if it wasn't possible then tried to deliberately time journey so LO could sleep in the car. I assume you still have 2 naps so if 1 is a mess then hopefully LO will cope as long as they get chance to make it up in the other and/or an early bedtime x