Students bringing babies to class I'm a student; recently, in one of my classes, a fellow student brought their baby in a stroller. She may have asked the professor beforehand for permission to do this. The baby cried, made loud utterances, and loudly kicked the inside of its stroller. Several students, including me, found this very distracting. The professor didn't react to any of this. What should he have done? Should students be prohibited from bringing babies to class, or are there some circumstances under which it should be allowed?

I didn't complain to anyone, as I assumed that the student brought her baby to class because of exceptional circumstances and that this wouldn't become a habit. I don't know whether anyone made a complaint. This has only happened once, during the most recent lecture.
A blanket ban on bringing babies to class is probably not allowed at many institutions. However, I agree that if the baby is acting up, then the supervising parent should take the baby out of the classroom so as to minimize disruptions to the overall lecture. 

This should be reached as an agreement outside of class time so that the lecturer is not placed in the position of having to stop lecture to ask the parent to remove his or her child from the room.