my baby 2month old her birth weight is 3.7 and now its 5.2 . is it normal weight?? In 12days she gained only 100g that means she getting enough milk??

A. getting sufficient milk.. if the baby pee count is around 6-8months, and baby is sleeping well.. ideally baby will gain around 500-700per months after birth.. and should double the birth weight around 4-6months and three times the birth weight at around completion of one year..