My son is underweight by 3 kg and 5-6 years old dress still fits on his body. what should I do to improve his growth.. also almost every other day he gets leg pain at night.. please suggest

A. Namatse Mom, One is the indiviual metabolism is such , but as far as he is active for his age and also eating healthy no worries. some variation is acceptable. Regarding the leg pain, this is called as growing pain, which quite a children suffer with, would recommend that massages , exposure to morning sunlight are helpful, also include calcium rich foods