I have sent a child home for crying once. His drop off time was about 8am and by 11:30 he was still crying. This was the 2nd day in a row of this behaviour so I called the mom and said I am unable to properly care for the other children, please come get him. He wouldn't eat, wouldn't sleep, wouldn't play. She was PISSED and in fact informed me when she picked up that she "would not take time off work again for something as trivial as crying". Pretty much told me to suck it up and deal.

Sometimes you just have to do it as it's too disruptive to the other children in the program.