Can't believe I was "that" mother today

At Little Man's activity this morning, I was "that" mother. New term, new location (closer to home), same company. As I walk up and see which group my darling son has been placed with, I am horrified...all the other kids in the group looked SO YOUNG. how will these children challenge my son and push him to do his best? It looks like they've only just learned to walk, let alone run, jump, hop on one foot and play t-ball!

Yes, I was that mother, thinking MY child may only have only just turned 3, but he is more suited to being with 3.5 year olds, there must be a mistake. He should NOT be with these children...they're, they're....well...just 3.

OK, so thankfully I was not that bad, but nearly. In fact, had the group leader not (rightfully) shut me down (in less than 3 seconds no less-methinks I was by no means the most formidable opponent she's faced in her years as Sports Leader) I may have taken the issue further. Thankfully she shut me down and I quickly snapped to reason, remembering this is an activity that is supposed to be fun for my son. It is nothing more.

I do hope I remember this little episode and can manage to remain humbled for all his and his sister's years of activities, school, work, friends...well, for all their lives. I don't like being "that" mom!

How do you strike the balance between advocating for your child, wanting to see them excel and be challenged and just letting them have fun and be 3 (or 5 or 10, or whatever age they may be)?