My son who is 4.5 years old was not gaining weight ,looks very lean and skinny.How can I make sure he is having all nutrition food on daily basis ,pls suggest

A. See the food that we eat every day like our traditional Indian plate that we have is loaded with nutrients and supplements if your child is going to eat well and healthy good amount of protein carbs and fats that it is going to be good avoid junk and sugary food for good health of your child and keep the child physically more active