she is feeding mother milk but not gaining what should we do and in which month we have to start solid to baby

A. Namaste Mom Monthly weight gain is expected in the range of 400 gm to 1 kg and by the age of 4 to 6 months they should double their birth weight weaning foods should be introduced from the age of 5 months of age here you can initially start with liquid consistency and gradually from age of 6 months you can give them semi solids and mashed foods