I started mine the same age as urs. He had no idea what i was talking abt. I took off his nappy as mis cat said and put him on the seat every 10 mins to avoid accidents. He took a while understanding. It was only after i sat myself and peed in the toilet in front of him he understood what to do!!!!!!! Embarassing but believe me they are too young to remember it :):) So u will not be blackmailed :)