Ds 7 months is long for his age. His feet touch the back seat of the car in his rear facing car seat. I’ve googled this and seems to be ok but I don’t understand how it can be? Isn’t that dangerous? Should I be getting a bigger seat already? At the moment his soles of feet can touch the back seat and soon I expect he will be able to properly press against it. He definitely can’t stretch out properly with a gap?