My son is )3 yr 9 m old how to weight gain..

A. Namaste Father, It is important to give exposure to the child of varied foods , provide healthy high calorie foods such as eggs ,if you prefer, dry fruits , nuts and seeds, fresh fruit milk shakes , stuff paranthas be it with panner , potatoes or vegetables , dal etc . ghee, butter , dals , legumes such as chana , rajma etc ,