<prompt> Failure to pass meconium within 48 hrs of bih in a newborn with no obvious external abnormality should lead to the suspicion of-Anal atresiaCongenital pouch colonCongenital aganglinosisMeconium ileus  <response>: Ans. is c i.e., Congenital aganglinosis o Read what Nelson says about Hirschsprungs disease Congenital aganglinosis. o Ninety nine percent of full term infants pass meconium within 48hrs of bih. Hirschsprung disease should be suspected in any full term infant with delayed passage of stool. 