Weight loss straight after birth average baby weight loss: the average weight for a baby to lose is between 5 and 7% of their birth weight in the first few days, this weight loss usually stops after 5 days top of page newborn baby weight gain the baby will then usually have picked up the initial weight that was lost by two weeks after birth. Infant weight loss after birth calculator. According to march of dimes, a baby who weighs under 5 lb 8 oz at birth has a low birth weight it is common for babies to lose around 10% of their weight shortly after birth.
infant weight loss after birth calculator
