my baby 7 month old weight only 7.5 kgs what should I do to weight gain

A. Namaste Mom check it as per the birth weight , which is expected to double by the age of 4 to 6 months and by age of 1 they triple it up, give the baby now semi solid and mashed foods and alter with your feed add ghee in their meals, also give dal, rice, porridge , made with ragi, suji , home made cerelac, other is steamed vegetables, fruits