I can sympathise with both sides of this, there are so many aspects to consdider:
Back in the day when I was a single parent, I still liked to get my nails done and my legs waxed, and my daughter came with me. She was from the age of 6, and I absolutely knew that she would sit and behave with a book. She didnt actually come into the treatment room at waxing appointments, she sat in the waiting area, and at nail appointments she sat nearby me, and the tech actually commented on how quiet she was. Had I though she would have kicked up a fuss, she would have gone to grannys or something.
So, I think its nice if salons can allow you to be the best judge of whether your own child will behave or not rather than impose policies which make it difficult for you to get there child free, however that would be all good and well if we could trust parents to use their judgement in this way, as from what I've read, plenty dont!
My beautician told me about one client who she was having a problem with, as she took her young son with her to get her bikini line done, she took him into the treatment room, and he sat at the seat at the business end of the bed!!!!!!!! Now fair enough he sat there and behaved, but isnt that a bit innapropriate? I think so, my beautician was looking for a tactful way to address this problem with her client, and for reasons like this I can understand salons applying restrictions to children.
Well I'm glad I read this, as this isnt an issue I had considered. I think I will issue a notice somewhere to say that children are allowed provided they will sit and behave during the treatment, and that I reserve the right to stop a treatment at any point if I cannot carry on because of unruly children compromising safety (or words to that effect).