I haven't read any of the other replies yet. Just wanted to say that I thought kids needed juice when my oldest dd was little. I still feel badly. I gave her pure juice a couple of times a day, and thought I was doing right by her.

I don't serve juice at all any more. My own kids (12, 10 and 8) can have orange juice on a Sunday morning if we're having a big breakfast, but other than that, it's water.