Irin,
i tried to make him go toilet every half hour, but he doesn't want le. ie, from 830pm, i ask him to go at 9pm, he doesn't want, then i ask him at 915pm, he doesn't want.. then at 930pm, he agreed to try, so we brought him to toilet, but nothing comes out.. then at 10pm, we change him to diaper and pajamas.
So i think like fail hor.