On the really cold days I was filling a hot water bottle and leaving it on the seat for 5min or so before I put baby in - then remove it just before we are about to get in
My 2yo always has her jacket on. It's too cold without the jacket in my opinion. 🙈
@Sofia each to their own but it’s really unsafe for them to be wearing a jacket in the car depending on how thick it is. A light weight one will be fine but if the straps are loose once that jacket is then taken off then it shouldn’t be worn in the seat.. being cold isn’t going to hurt them but an accident with a poorly fitted harness because of coat may.
You can use a blanket in a car seat. It’s no coats or thick jackets etc that aren’t allowed. My boys seat stays in there car all the time on matter the weather I just put him in there and put a blanket on him after he’s in. The car warms up pretty quick.