Noah is currently in a group 0+ car seat rear facing hobby which he has had from birth, but he seems to have grown out of it! He has to have his legs bent against the car seat and can't stretch out so I am looking at getting him the next one up, group 0-1. The dilema is, is that it says from 9 months plus! It does say you can rearward face it but they have to be at least 18kg's to use it. Noah Is 18lb 5oz is that big enough? Anyone know if it's ok to put him in the next car seaf up? Obviously I want him to be safe in the car but at the same time comfortable!