melissa
had same problem with my son at that age.he would hold his bowel movement because he did not want to have a bowel movement at school,other peoples houses,etc. went to the doctor and doctor said he had stretched his sphincter muscle and the bm was coming out around a bolus of bm. he needs to be cleaned out of the bolus and we had to give mineral oil to loosen the bm so that he had no choice in holding it. this worked about half. he eventually out grew it. i know it is frustrating but hang in there and be patient. it is more common than you think and he probably is just embarrassed to go the bathroom any where else but home. good luck!!!!!