tHi dctr my baby is now fourth month.. her weight is 5.2 is it normal

A. Weight of baby largely depends on the birth weight in the initial months. Ideally, they should double the birth weight by tge time they turn 5 months old. Best way to increase it is by feeding milk frequently and fully. If breastfeeding, then nurse 6-7 times a day which will include atleast one night time feed too after waking him up. If giving formula milk, then feed 150-180 ml milk 5-6 times a day.