<prompt> X-ray detect congenital anorectal malformation at:Immediately after birth24-48 hours48 - 72 hoursAfter 72 hours  <response>: 24-48 hours 178-G 1286-87-Nelson 17,h 152-Ghai 7thAnorectal malformation AT birth the bowel is not distented; there fore clinical and radiologic evaluations are not reliable during the first 16-24 hour of life. A cross table Lateral film with the patient in prone inverted position taken after 16-24 hours of life is valuable for determining the position of rectal pouch. During the first 24 hour of life, all these patients need renal and bladder ultrasound evaluation to identify an obstructive uropathy. 