I am almost positive that for all the integrated seats your child needs to be at least one, and over 20lbs. I have never seen an integrated seat that was rear facing and to turn the munchkins around the rule generally is 1 year and 20lbs, with the 1 year being more important that the 20lbs. (After talking to the doctor we had friends got the green light to turn the seat around for a 1 year old who was only 19 lbs.)