6 and a half year old children often leak stool may be anal trauma, congenital developmental malformation of the anus, cauda equina injury and other diseases caused. 1. anal trauma: 6 and a half year old child anus trauma, will cause anal sphincter contraction dysfunction, there is anal sphincter relaxation performance, in the child coughing, exercise, constipation due to the increase in intra-abdominal pressure, there is often anal leakage of stool phenomenon. 2. Congenital developmental malformations of the anus: for example, congenital lumbosacral spinal bulge, congenital spina bifida and other congenital developmental malformations of the anus will lead to incontinence of the anal sphincter, puborectalis muscle, non-functional, and can not be controlled at any time when there is a desire to poop, and the child will often have the phenomenon of leakage of feces. 3. Cauda equina injury: 6 and a half year old children due to spinal fracture, pelvic fracture, resulting in absolute or relative narrowing of the lumbosacral spinal canal, can cause cauda equina injury, the function of bowel movement is innervated by the cauda equina, the cauda equina is damaged, there will be frequent leakage of bowel movement performance. 6 and a half year old children often leak stools are considered abnormal, it is recommended to consult a doctor in time, the specific cause through the examination to determine, under the guidance of the doctor for treatment.