Help on potty training my son?

My son is 3 and he has speach difficulties. He talks his own way and only I can understand him and he understands everything everyone says. He is smart but has problems pronouncing the words. I explained to him what the potty is for but he is scared of sitting on the big toilet so I got him a toddler one. He keeps... show more My son is 3 and he has speach difficulties. He talks his own way and only I can understand him and he understands everything everyone says. He is smart but has problems pronouncing the words. I explained to him what the potty is for but he is scared of sitting on the big toilet so I got him a toddler one. He keeps saying he doesnt want to use it and he says he wants to use diapers. I've explained to him many times he needs to use the potty instead of the diaper and I told him he can use whichever potty he wants but he keeps saying no. Any help?
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