my kids are preterm. ...milestone depends one each individual. ..at these age main important is bone strength*(back). ..two words..(differs afain)so don't worry much...anything very important .concerned. .best to talk with ur doc

they tend to do most of the things a little fast than the other full term babies. or they might be even a month late in doing things also but do not worry both are normal. Just enjoy your motherhood to the fullest.