A 6-year-old child’s inability to hold in his stool may be related to factors such as anal sphincter relaxation, spinal cord injury, and diarrhea. 1. Anal sphincter relaxation: a 6-year-old child with an overly relaxed anal sphincter may be unable to artificially control his bowels and experience pooping in his pants. 2. Spinal cord injury: If a child has a spinal cord injury, it may also result in an inability to control bowel movements and fecal incontinence. 3. Diarrhea: Diarrhea can also cause fecal incontinence, but it usually improves slowly after treatment and returns to normal later. There may be other reasons why a 6-year-old child can’t hold back his or her bowels, so it is recommended that you go to the hospital in time for a relevant examination to determine the cause of the problem and then actively treat the symptoms.