Why do they say you shouldn't feed newborn baby water?

Newborn babies up to 6 months get all the hydration they need from breastmilk or formula. They do not need anything else. These liquids also work on quenching their thirst and giving them the nutrients they need. Water has no nutritional value and if taken instead of milk may make the baby full and thus take the place of the nutrients the baby needs and gets from milk.

The immature kidneys of an infant under four months of age cannot balance salt and water effectively, and too much plain water (tap water or water without added salt) can actually dilute your baby’s blood. This can lead to low salt balance, a medical condition called hyponatremia. http://www.babble.com/baby/water-sippy-cup/

Too much water can lead to a serious condition called oral water intoxication. It basically dilutes a baby's normal sodium levels and can lead to seizures, coma, brain damage and death. Read more here: http://www.stlouischildrens.org/articles/wellness/water-intoxication-in-infants

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if its hot, then should not be a problem, of course baby needs extra water. its fine

thanks

how much? is even a little bit bad?