my son is 7.5 years old ..his weight is 25 Kg. he is too weak....some suggestions for weight gain

A. Mam actually for a 7 1/2 year old child the weight should be somewhere around 23 kgs so child is already 2 kg more than the expected weight again I don’t know how your child is looking weak but your child is maintaining a weight on the positive side which is a healthy sign