Can I give water to my baby?
If your baby is under 6 months old, they only need to drink breastmilk or infant formula. From 6 months of age, you can give your baby small amounts of water, if needed, in addition to their breastmilk or formula feeds. What happens if you give a baby water? So giving a baby younger than 6 months even a moderate amount of water in a short period of time can lead to hyponatremia, which at its most dangerous can cause brain swelling and even death.