Sometimes children are afraid of the flush sound. Sometimes they are afraid that they'll be sucked down just as the waste is. Another idea would be that he wants control- in this case you'd need to ignore his bathroom habits or be very low key about them, and I would have him clean up any mess. Putting him back in diapers may signal it is OK to not use the toilet, so may underwear that he likes- and must clean out if it gets soiled. Or you can wait a month or so and try again. Good luck!
at 7:33 AM on Aug. 24, 2013