What to do - my child got hurt

[Sandbox Sally]

I'd take him to get checked out. A blow to the belly can cause damage that's not immediately apparent. Can't hurt.

It sucks that this kid hurt your son, and I know it angers you. I'd feel the same, but if the roles were reversed, you'd see it as more of an accident, I think. You don't know this boy well enough yet to really guess whether he'd do something so violent on purpose. I urge you to give him the benefit of the doubt.

I'd talk to both of them on Monday about rough play, and set some concrete consequences.

Good luck with your son. I hope he's ok.

[gcj]

Yeah. Rough play is absolutely zero tolerance around here. If he has a history of playing rough, he should have to be with you in the kitchen...or where ever the other kids are with you. Being left alone in a room is a privilege that must be earned by trustworthy behavior to avoid these situations.
I personally would keep an eye on your son before taking him to be checked...but only a mom can make that decision.
Good luck.