I always think of this as "the Breastfeeding Carol" and love it dearly, but I'm disappointed that its most intimate verse is left out of so many church hymnals. Indeed, it isn't in the lyrics that Joe posted above, although it is in Allison's:

Enough for him whom cherubim worship night and day,
A breast full of milk and a manger full of hay:
Enough for Him whom angels fall down before,
The wise men and the shepherds who adore.