Anal atresia is a condition that a baby is born with. It is a problem with the development of the anus and the part of the intestine leading to the anus. Anal atresia can make it difficult or impossible for the child to pass stool. The specific problems can vary but may include:

  • Anal opening is too narrow or in the wrong place
  • Membrane covers the anal opening
  • Intestines are not connected to the anus
  • An abnormal connection between the intestines and urinary systems, allowing stool to pass through the urinary system

Most of the time, anal atresia can be corrected.

An unborn baby's intestines develop during the fifth to seventh week of pregnancy. A disturbance in this development causes anal atresia. The exact reason for the disturbance isn't clear.