My son is coming up for 3.5 and is still refusing to use any kind of potty or toilet. I need help!!!! We have been trying for about a year to get him to to even tell us when he needs a wee/poo but he just goes.I have tried without nappies for about 4 days recently and he still just did not seem to have any sensation before he did anything and then got upset when he was dirty. Should I go to the doctors or just persevere. Don't want to make it a major issue but it is getting that way with us. Please help if you can.