Flight 2468 to flight 1804 is only a 40 minute connection. No time for any lounge visit in ATL. There will be no meal service on either segment.
I would suggest that you purchase a "to go" sandwich before you board in IAH and enjoy it on the flight. Chips and some kind of sweet will be part of the snack basket and you will be served drinks in F.
I hope your son is a fast walker.