the weight of my child is only 8kg what can I do he eats everything else oats

A. Hello mom you can check his weight according to his birth weight which they tend to triple It by the age of one year and then on yearly they gain about 2 to 4 kgs yearly. . Also if he was a preterm baby . You can give him fresh fruit milk shakes , lentils and legumes , dry fruits and nuts , stuff paranthas , millets , eggs , stuff paranthas etc