my child is 3+ years old and his weight is 12.5kg only. he is a hyper active child and eats healthy food but still don't gain much weight. in last 2 months he lost 1kg.

A. Then You may as well get a check with your doctor once a doctor would be able to give you connect a device according to that so I think there could be some issue which is why your child is losing weight and on gaining appropriately as well so it’s better that you get a chat with your doctor