I found out the hard way, a breastfed newborn often loses weight in the beginning until milk production begins in earnest. Some trimming down is to be expected, A type of jaundice. A normal range of quickly and long the weight loss lasts has been fully know.
A team of researchers have developed the newborn weight tool, or newt, which compares a newborn weight in the first few days of life against those of other babies.The free tool relies on hourly birth weights. A handy graph shows moms and pediatricians the baby weight falls on the growth chart so they can figure out if time to supplement with formula or continue nursing exclusively.