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.
Can I let my 3 month old drink water?
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.
How much water can a 3 month old baby drink?
For children younger than 12 months old, monitor how much water is consumed in a day. If it's more than 8 ounces, it's likely too much. For younger infants, in particular, drinking too much water can result in water intoxication characterized by electrolyte imbalance and even seizures.
What happens if a baby drinks water?
Louis Children's Hospital Diagnostic Center, too much water dilutes a baby's normal sodium levels and can lead to seizures, coma, brain damage and death. Breast milk or formula provides all the fluid healthy babies need.