Why is my baby weight low 7.88 when compared to other kids of the same age!! My baby is one year one month old

A. To increase baby weight, include fat and protein rich foods like potato, rice, pumpkin, sweet potato, eggs, chicken, fish, legumes, ghee, milkshakes with dry fruits, banana, avocado and 550-650 ml milk everyday. Feed 3 main meals and 2-3 times healthy snacks including variety of fluids like water, fresh juices, curd, buttermilk and coconut water.