Usage: If your baby is in daycare, pre-school, or Montessori, then you can use the class sign to describe that group of school friends.
If your baby is just about to start school, you can use these flash-cards to start to teach them what to expect when they start and help ease the transition to that new environment.
To learn how and when to teach the sign, take a look at the class page for a video, diagram, and tutorial.