my 18 month old not gaining wt properly, her birth wt is 3.7kg and now it is 9 kg, wt is the percentile? and what should I do?

A. Your child should have been somewhere around 11.7 by the age of 12 months I’m just evaluating on the basis of the birth weight so you can imagine how far behind your child is on that basis you should give more of proteins into the diet and a balanced diet is very important