Giving baby water?

Just curious, what is the age recommended to give water now? Someone is saying that women give their babies water before their breast milk comes in (I breastfeed and have never heard of this and definitely didn't do it) and to give a baby under 2 months old water in between feedings. I've always heard not to give a baby water until they're 6 months old and even then just little sips. But maybe things have changed. 

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