DS1 is 3y2m and is not toilet trained. Over summer he got really good at it and wasn't having accidents at home. Would not use a toilet anywhere else so had to stay in nappies at daycare. For the last few months he has been terrible and now needs a nappy at home as he wees everywhere. If you ask him to go to the toilet he refuses then wets himself straight away. I know it's normal to regress a bit but this has been going on for ages and because of his age I'm starting to feel it will never happen. Any hints please?