hmmm i think it can be alittle acidic
i found this, maybe it will help:
" Pineapple is not a citrus fruit (it's related to the bromeliad family actually.) however it can be acidic. Processed pineapple tends to be less acidic due to the processing and sugar/syrup that it's packed in; but we're sure you'd rather not give pineapple out of the can. If your baby does not have any food intolerance's and has shown no propensity to getting rashes due to foods, then you might give it a try around 10 months old. Many parents do feed their little ones pineapple around 8 months old.
For pineapple, mash it up and add it to yogurt, cereal, chicken (yum.) even sweet potatoes. Pineapple tends to be fibrous and if it's too fibrous, give it a gentle steam and see if it softens up enough for your baby. "
this is the site i got that from:
http://www.wholesomebabyfood.com/citrusbabyfoodrecipes.htm