My baby is 2 months 28 days old and weighs 5.5, is it correct?

A. Hai good morning !! Babies gain 400-900 gm per month,by 5-6 months they double thier birth weight. Check if baby gaining ideally ,according to age baby weight is fine. Breast milk or formula milk is suggested exclusively until 5 complete months,from 6th month onwards start semi solid foods.