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.
Should you decide to give your baby water, please limit how much you are offering. Baby should drink no more than 2-3 ounces a day or as your pediatrician recommends. You do not want the water to displace the intake of breast milk and/or formula.