Hmmm.... tough call. If they ran outside of the diaper then yes I would call. There's a contamination risk there. If it's contained in the diaper and it's just been 2 then that could be food related. I don't think I would call just yet. If his behaviour changes, doesn't want to eat or drink or continues with diarhea then i would call the parent to come get him. The fact that you think he's looking pale might concern me. I may try to get some water into him.