When they are getting the right amount of food, you’ll see:
Plenty of wet diapers. The first few days after birth, they may only wet one or two diapers each day. After that, they should need six to eight cloth (five or six disposable) diaper changes every 24 hours, plus have two to five poopy ones each day.
Steady weight gain. After the first 2 weeks, your baby should gain about 4-7 ounces per week until their sixth month, and 3-5 ounces from 6 to 18 months.
Your baby is active and happy. A child that’s eating well will look alert and be active. They’ll also seem content between feedings.