From the Cooperstown Dreams Park Official Rules
Headfirst sliding is permitted only into first, second, or third base. Headfirst sliding IS NOT allowed into home plate.
In the second game of pool play for our team, our leadoff batter worked a walk. He went to third on a single. He then tried to score on a pass ball. He read the play well and got a good jump. The catcher got the ball quickly and tossed it underhand to the pitcher who was covering home plate.
Our runner easily slid under the tag, but was called out for sliding head first. Our coach knew it right away and was upset that he did not make that rule clear to the kids. We won the game 13-1 so this play was forgotten.
The play described to me by that coach I recently talked to will never be forgotten for those involved.
If I understand the story correctly from the coach. The game was tied 7 to 7 in the bottom of the last inning. The bat pinged and the ball went into the gap. The runner on second base got a good jump and read the play perfectly. He rounded third and was going to score with no play at the plate. The runner decided to slide head first into home in celebration. The team rushed the field to celebrate, but the umpire called the runner out for sliding headfirst. The kid was devastated. The inning ended 7-7 and the team that had thought they won ended up losing in extra innings.
The Main Point
Coaches, it's not enough that you read and know the rules. your players need to know them too.