DD is almost 11 months and we are going to buy a new car seat and give the current one to MIL for when she looks after DD when I go back to work. It's a SNS Premier and can rear face to 12kg. DD is about 9.4kg.

I want the new car seat to be rear facing as long as possible but also to be able to be used long term (eg convert to booster when DD is older). Does such a thing exist? If so, what is it? If not I guess we can get one that's 0-4yrs and use it with a second bub and get DD a booster when the time comes. Just trying to figure it out and what seats are best for ERF?