The severity of anal stenosis in newborns depends on the diameter of the anus. Anal stenosis means that the diameter of the anus and anal canal becomes smaller, and determining whether neonatal anal stenosis is serious or not needs to be determined on a case-by-case basis, and cannot be generalized, but mainly depends on the degree of anal stenosis and complication situation. If the diameter of the anus and anal canal is significantly smaller, the condition is severe and the clinical manifestations are heavy. Secondly, there is the possibility of complications, such as secondary megacolon. For mild anal stenosis, it can be treated conservatively with dietary changes, fecal softeners, and mechanical anal dilation. For moderate to severe anal stenosis, surgical treatment such as anoplasty or sphincterotomy should be considered. When the examination shows the presence of anal stenosis in newborns, it is necessary to go to the hospital and cooperate with the doctor for active treatment.