Question: how many ounces a day should a breastfed baby gain?
Answer: Breastfed newborns can lose up to 10% of their birth weight during the first five days of life. Then, by the time babies are 10 days to two weeks old, they should regain the weight they lost. 1﻿ After that, for the next three months or so, breastfed babies gain about an ounce a day.