Question: how many ounces of fluid does a baby need to stay hydrated?
Answer: Most babies need about 1½ to 2 ounces of breast milk or formula each day for every pound of body weight. Babies need to eat more than this to grow! Babies need to take at least this much to prevent dehydration: If your baby weighs 4 pounds, he or she needs at least 6 to 8 ounces of fluid each day.