If your little baby falls asleep in his pram, keep an eye on him because the pram may get hot and airless very soon.
You better protect your baby from the sunlight when your family travel in a car. If your baby falls asleep in his car seat, you must watch your baby all the time to make sure he/ she comfortable. The temperatures inside a parked car can rise frighteningly quickly no matter you open the windows or not.
Temperature changes can be harsh on your little baby so before taking him out into the heat, switch off the AC or cooler and let him adjust to a gradually warming room. Once the room is warmer you can take him or her out. This is good for your baby and help him/ her a enjoyable travel.