Radnor Township police say 41-year-old Richard Little assaulted the student last week at Presbyterian Children's Village. Authorities say it started when Little says the student threw chalk at him.
Investigators say a supervisor at the center told officers he saw Little pull the girl into the hallway and hit her in the face.
Little posted bail after being arraigned on charges including aggravated assault, simple assault and reckless endangerment.
A phone message left for Little's attorney was not immediately returned Thursday.