Sorry to be a post hog, but we just got back from vacation, so I'm catching up on the Nest.
LO used to HATE juice. We would try to give him juice when he was constipated (before we started the daily Miralax) per the pedi's suggestion, and he wouldn't even take one sip. Then he got sick two weeks ago and was barely eating. One night DH gave him some juice, and he chugged it. Now, it's always, "more juice peez!"
Since he's never really been much of a juice drinker until very recently, I'm not sure how much to let him drink a day. I've been giving him the Gerber toddler juice that has 40 percent less sugar.
Re: If your LO drinks juice