Bit of a strange one, but very annoying. My son Leo is 5, he's at mainstream school full time. He's coping pretty well and he likes it.
The problem is that his attendance is being affected by his tendency to have a runny tummy. About 80% of the time it's like he has diarrhoea. But he doesn't , it's just the way he is. He has been examined by various doctors, has had blood tests and no medical issues have been found. It's probably irritable bowel (I think) but we don't have any diagnosis other than its nothing sinister, don't worry.