Babies that are born with Hirschsprung therefore fail to pass the meconium, their first stool, a process that usually happens within the first 2 days after birth.

先天性巨结肠的患儿因此能排出胎（生第一次大便），这一过程通常在出生后两天内发生。

The fetus's digestive system isn't totally empty, though: some waste does go there and get broken down by acidic bile in the small intestines, producing a slimy, sticky greenish mass called meconium.

然而，胎儿的消化系统并全空的：一些废物进入这里，被小小内脏里的酸性胆汁破坏后，会产生一种粘乎乎的绿色块状物，它被称为胎便。