Parenting

Figuring out how much a 3 week old should eat — or any newborn in the first two months — is one of the most common questions new parents ask at 3 a.m. This newborn feeding amount calculator estimates a reasonable per-feeding volume and total daily intake using your baby's age in weeks, current weight, and whether they are breastfed, formula-fed, or combo-fed. For example, a healthy 3-week-old weighing about 4.0 kg (8.8 lb) typically takes 2.5 to 3 ounces every 2.5 to 3.5 hours, totaling around 22 to 28 ounces per day.