my baby weight when she born is 2.800 gm and after 1 month she is just 3 kg why my baby is not gaining weight

A. It's very common in infants. for newbies is common to shed some weight after birth and it applies to almost all babies. They burn calories for crying, having milk, breathing etc..it's quite normal.. They shed around 10-15% of birth weight in first two to three weeks and will slowly regain their weight within a month or two.