Water is necessary for carrying nutrients to your cells, flushing bacteria from your system, preventing dehydration, and replacing fluids lost from sweating, but you may not need to drink as much as you thought.
Stephen R. Daniels. pediatrician. No. You shouldn't give your newborn water or sugar water. And if you're feeding powdered or concentrated formula to your baby, never dilute it with more than the amount of water called for on the label. Your infant will get all the necessary hydration from breast milk or formula.
Well, provided you are breastfeeding on demand or offering enough infant formula your baby will get the appropriate amount of hydration from that. Further, offering water before 4 to 6 months of age could lead to other problems, such as: Weight loss or insufficient weight gain in the infant. Since the baby could fill up on calorie-free, fat-free water, he'll drink less breastmilk or formula.