I would speak to your childs doc before putting anything other than her milk through the tube. Some docs do say yes. We have done it for my son plenty of times. If you do puree some fruit, I would suggest starting with applesauce or prunes before bananas. Bananas can constipate some people, but helps others go. Bananas constipate both of my boys. Also, juices (low acid content ones) are good too, and you run less of a chance of clogging the tube. best of luck to you and your daughter! :)