How to make my Son fat

Hi All,

I have a 7 yr old son. He is a picky eater and much taller to his age. so looks thin.

I want him to put on weight. I feed him full plate rice at nights, he eats fruits 3 servings per day. Grapes, Watermelon, apples, pears, pineapple are his favourites. I give him nuts but he eats less. he drinks 1-2 cups milk.

still he plays so much so i can eaisly feel they get burnt. I wanted to give him some protien shakes but donno if they are safe for 7 yr old.

Please suggest some ideas to make him fat.

How to make my Son fat