My SIL & MIL both break out in red bumps on the back of their tongues if they eat banana, that's all they get so they can still eat it - I've never had a problem but our first DD broke out in the same red bumps and would gag when we tried her with banana. We waited almost 18months before trying a little bit with her and she got the red bumps - she also gets them when she has strawberries but apart from that, she's fine. She eats banana regularly now and the reaction hasn't gotten any worse, if anything, the red bumps are slowly easing.