I agree with Analise on this. The parent is responsible for the child if the child is given the privilege of a lounge visit (and the previous post is also correct: a lounge is not an airport or even an aircraft cabin, where people should have a higher level of tolerance, as everyone has to coëxist in a confined space).
If you want to bring children into a lounge or into a bar, please remember that many other guests are there to relax. On the other thread on this topic, a poster indicated that his child would ask every other guest in a lounge some questions, and the poster indicated he felt that this was OK.
It is not OK. Children should be expected to behave: quiet and polite behavior, or they should be removed by the parent from the lounge. Disturbing other guests is not quiet nor polite behavior.
If my brothers or I had misbehaved (read: running around or screaming) as children in a semi-private place like the bar at the country club, not only would our parents have removed us, there would have been disciplinary consequences.