my son is 3 year 11 month old but his weight is 11 kg and height 90 cm.he is too weak but he is active more than my 9 year old girl.what I can do for his health.

A. Small kids generally are really very high on energy so do not compare to kids but he has the weight is definitely less I suggest you to kindly do more of proteins into the diet of your child as it is important for a good role for the child to have proper height and weight also