My baby was born with 3 kg of weight ..then weight decreased to 2.6 kg...now ny baby is 28 days old and weight is 3.1.

Is it a matter of cocern..he is on breast milk....everyone keeps on saying to give him formula milk as he is not gaininng weight...pls help me out i dont want to gibe him fm...and am converned abkut his health..

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