A.S.
It has been proven children have a problem having bowel movements because they feel they are loosing a part of their body. When they go in the diaper it is different because it still stays close to their body but once they go in the toilet it actually feels as though they have lost something they need. This may sound gross but I was able to help my son with this problem by having him in the bathroom with me and showing him my bowel movement and explaining to him it was okay to do this and that everyone does. He is three and I have not had any problems since. It did take a few times and I would always comfort him when he himself was going to the bathroom. I would rub his back and ease him through it with a calm voice. I hope this helps you and good luck.