my baby is 17 days old , and she lost 10% of her birth weight in the first week but still has not gained their birth weight ...is it ok normal?

A. A child gets weight a minimum of 500 g every month that is important to be seen an initially child can lose some weight because of jaundice and improper feeding but after that if the child is not gaining 500 g every month then it may be an issue that we recommended for giving formula alongside