Have just been talking to my sister (a doctor) on the phone, so I asked her about it. It's not uncommon, and can be sorted out with air blown gently into the intestines form the rectum. This often 'untelescopes' the bowel, with no need for surgery. Barium can do the same. But if an op is needed (resection of the affected area) it isn't serious and heals up pretty quickly. Hope it can be put right with the 'air' method, but I realise it's always worrying to have a little one ill and in pain. Very best wishes for your grandson's speedy recovery Mike.