My baby girl is 11 months old and she is a preterm Baby, at the time of birth her weight was 1.8kg .and now she is 7.5 kg is it correct weight or under weight ?

A. If you look at the two facts that your child is a premature child and born with a really less weight gain this one’s very good as per the age with progressing is the child is going to gain more of course but right now this is good enough for the child