I never heard of it but that was the problem he was born with - the reason he has yet to go home from the Hospital. I guess his Surgery is today… or was today. Apparently it went well, thank god.

According to About.com - Hirschsprung Disease 

Definition: A birth defect in which some nerve cells are lacking in the large intestine. The intestine cannot move stool through, so the intestine gets blocked. Causes the abdomen to swell.

Common Misspellings: Hurschsprung’s Disease, Hirshsprung’s Disease