my baby is 2 months old... but still he s luking very weak.. what can I do for his good health

A. hello if the baby is gaining a minimum of 600 grams to 800 grams per month then it is a good weight gain and is absolutely nothing to worry and also make sure the baby is getting sufficient breast milk and if not then you can be giving your child infant formula milk stage 1 using a bpa free bottle like Babyhug