What a conundrum!
It seems to me the best way to handle the issue, or expected issue, is to address all noise and disruptions at meetings....talking, ringing cell phones, moving about, disruptive children, etc. We use a bell to draw attention when things get annoying, for example.
We had a very few young children at some meetings a few years ago, but a close friend of the mother's mentioned that she thought other members were disturbed by the moving around and talking to mom. The mom "got it" and only came to meetings after that when she had made arrangements for the kids.
Jan in VA