@Alex: You do realize that breast milk is not at all like excrement, right??

I had a professor in the late '90s who occasionally had to nurse her infant in class. It was really not a big deal and in no way disruptive. I wonder whether the people complaining how "unprofessional" this was have actually ever been in a room while a mom nursed her baby? In most cases, the act doesn't expose much, and it doesn't require the mom to divert her attention from other tasks.