You'll know if your baby is getting enough
Though it's normal for a newborn to lose a bit of weight in his first few days of life, he should start gaining about an ounce a day after the first week. But there's no need to put him on a scale: Your pediatrician will weigh and measure him at his monthly checkups. "If your baby is growing and gaining weight, he's getting enough to eat," says Dr. Wilwerding. In between visits, you can assess his milk intake by how often you have to change him. You should see about five to six wet diapers a day and, until he's 6 months old, usually a dirty diaper after every feeding or, if not that often, then at least three times a day. That pattern will change once your baby starts eating solid foods.