How do I increase my 21days baby weight from 3.4kg his birth weight was 3.5kg I’m stressed out about his weight gain please help

A. hi babies weight gain depends on their birth weight, usually they gain 250 to 500grams per month . so please don't take much stress for this. to increase your child weight,please do the following things: please breastfeed your child as per his or her needs. feed your child on each breast at least 20 minutes a day so he or she can get full fat hindmilk well which help to increase your child weight. give Massage to your child daily.