Actually the doc I took my DD to (when she was about 10) said he sees sooooooo much of it in younger kids - sugary cereals, soft drink yada yada yada.

I think my dd has uummmm fragile guts. Lots of my family have tummy trouble. She has a good diet but she knows if she is lacking in fibre cos she pays big time! She is 15 now though, so most of it is up to her...