<prompt> Newborn loses how much weight in first week?5-101-210-20None  <response>: Ans. is a i.e., 5 -10 Weight loss in neonateso It is expected that newborns will lose some weight in the first 5-7 days of life. A 5 weight loss is considered normal for a formula-fed newborn. A 7-10 loss is considered normal for breastfed babies. Most neonates should regain this lost weight by days 10-14 of life. 