Up until 6 months of age, babies can’t drink water because their kidneys have not matured enough. They get all the fluids they need through breastmilk or formula even on hot or dry days.
It can be dangerous to give young babies plain water because their immature kidneys can’t handle free water easily.
This leads to accumulation of extra water in their blood lowering the concentration of salts causing what is known as ‘water intoxication’ (water poisoning).
Water intoxication can cause babies to look and act sick, be tired and lethargic and can even cause seizures.