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.
When baby start drinking water, you can serve the water in a small regular glass or specially designed age appropriate sipper-cups. If you are serving in a small glass ensure you give small sips. You can teach your baby to hold a cup/glass to drink water.