my son is 19 month old .his weight is 10kg. why he is not gaining weight

A. Hai good afternoon !! Babies after 6-8 months gains weight slow,sometimes remain constant for2-3 months,due to achieving physical milestones crawling,standing,walking being active,playing,moving most of the day results in less weight gain.. If baby is active,achieving milestones then no worries. According to age baby weight is fine,give protein,calcium rich foods.Seasonal fruits,vegetables,dals(lentils,legumes),cerelac,ghee, cheese,butter,curd,paneer,tofu,nuts as powder or ladoo/barfi,egg,meat helps in weight gain.