Potty training started on Monday. He is doing well but now it appears that he has started holding his wee in. He will go all night or all afternoon without a wee, until he is busting, then he'll sit on the potty crying and writhing in pain, with me cuddling him, until eventually the wee comes out and he smiles and tells me it's stopped hurting.
I thought this would pass but he's done it again this morning. I'm worried that he will damage himself.
Any experiences or advice please?