my baby is not gaining weight... her birth weight was 3.2 after 2 months her weight is 3.5 is it normal and how to improve

A. hello babies birth weight will initially reduce and then starts to gain and if baby is gaining a minimum of 600 grams to 800 grams per month or 150 to 200 grams per week is a good weight gain means baby is getting sufficient breast milk else you can express using Babyhug breastpump and check in the same too