My baby boy’s birth weight was 4.040 kgs. Now he is 1 month old abd his weight is 4.1 kgs. Is this normal?

A. A child should gain a minimum of 500 g in a month approximately 400 g to 500 g is considered very good so your child hasn’t gained anything as such if you look at it so this is not proper I suggest to talk to your doctor start with formula fee