I gave my son little bits of boiled and cooled water in his bottle when he was a couple of months old

Baby shouldn’t need water until weaned from full time milk as food. And definitely boil and cool, to make sure there’s no gremlins

Offerng small sips when having solids. Not to drink as such.

I’ve always given cool boiled water to my kids when they were growing up. I started introducing water when the child started their solids as the idea is to slowly introduce a normal diet like ours . S it would be a balance of milk, water and solids. I had great guidance from the Childhood clinics so if concerned talk to one of the nurses there .