hi my baby boy had birth weight 2.7 now at 3.5 month he is 6.7 kg is it normal cause I have a very low supply of breast milk he is completely on formula milk?

A. normal baby should be double the birth wt at completing 4 to 6 months and three times the birth wt at completing one yr.. you cn give formula milk if mother milk is not sufficient.. use Babyhug sterizable feeding bottle..