D.M.
aside from the sugar issues... My son loved pineapple, but it gave him awful diaper rashes until he was about 2.5 or 3-ish, even in small amounts. It took a while to realize what it was because even in some of the baby food fruit blends it had traces of pineapple. Now at almost 4 it doesn't seem to bother him at all.
As for the sugar issues other moms mentioned, you can find some coctails in fuit juice or we used to by the light syrup versions when we couldn't find that and rinse it in cold water before giving it to our son.