Thanks Kate. I'm not sure if he's had too many vegies and that upset him, his cold/bug from the swimming pool or the nappies. Haven't been swimming since, have gone back onto basic food for him - Farex, apples or banana, and back into huggies. So far so good. Once he's back to normal and he's stopped pooing 100 times a day, I'll add one variable at a time and see what happens.

Now if only he'd sleep!