my baby is 4month 18days old but she is not gaining weight.

A. Hai good morning !! Check if you have sufficient milk production. If baby on breastfeed improve supply by including lactating foods in diet - Milk and diary products, rusk, roasted bread, papaya, chikoo, bottle gourd, Poppy seeds, garlic, kheema, garlic milk. give frequent feeds , substitute with formula milk if you don't produce enough milk.