My son started telling us that ge wants to go potty at the age of 2.5 years but he does potty only in diaper. Now he is 3.5 years old still using diapers for potty, but he never wets the bed.I am trying hard to make him use the washroom for potty but still he refuses and asks for diapers. If we don't put on his diaper he starts holding on to his potty. What can be done in this case? Is it ok if he holds his potty for a day.?