Whatever happened to the former Smoking area at the ORD AC? The one with the pretty glass walls and door that closes. If that is still there I bet it would make a good playroom!
The one Boeing2027 talks about is between the HK and L concourses (sort of past Wulfgangs pizza place) .. it may be a long walk (yea I know tire the kid out) if you are staying in the HK complex.
I know the former smoking room at the ORD FL is still there with door that closes .. but the OP as GLD would need international P in order to access that one ...