my son is not at all gaining weight from last 3 months.He is 11 months now but his weight is 8.3 kgs. how can he gain weight

A. good wt gain baby has as baby should be 3 times the birth wt at completing one yr... gv potato sweet potato ragi dalia eggs banana avocado pumpkin dry fruits nuts abd seeds ghee butter cheese in moderate amt... start with vit supplements as zincovit