I, too, wish all these kids could wrestle on a full mat. All I am saying is to crawl out of bounds intentionally is fleeing the mat.

"Fleeing the mat: Leaving the wrestling area to avoid the opponent’s
attack, punishable by a caution, plus a penalty point and choice of position to
the opponent; two penalty points if fleeing occurs from a danger position."

This comes from the rules book the the home page of this site. But back to the topic... 1/4 mats for some kids does make things hard but deal with it and move on.