Baby needs to eat every two to three hours – but if you're nursing, it's tough to know how much milk she's getting. "The baby's weight is the best indicator in the early days," says Dr. Tolcher. Your pediatrician will check it within a few days of discharge. A newborn loses 5 to 8 percent of her birthweight within the first week but should gain it back by the second. Diaper-counting can also act as a gauge: her schedule those first five days is haphazard, but after that, you'll see five to six wet diapers a day, and at least one or two stools.