A friend who works as a hairdresser told me many women arrive with their children, ignore them, expect to be pampered as usual, and the salon staff to look after the kids like a free crèche.
Don't schedule your appointment during the school holidays just because you've taken a day off work to look after the kids. Use that time to actually do something with your children, not to get your hair done.
Plus the added mess the child leaves is not the hairdresser's responsibility. The parent should pick up the biscuit pieces, drink carton, sweet wrappers, crisps packet, etc.
And then there's the noise. From the happy, giggly toddler sounds, which still seem out of place, to the high-pitched wailing and tantrums. Then there are the older children's electronic games and 'tunes' on their mobiles which, apparently, can't be played on headphones and must be played aloud for all to hear. It's all wrong at the hairdresser's.
While we don't all have the luxury of regular childcare, most have some sort of support to get out child-free for a few hours. By the way, it did take two to make a child so surely the other parent could take them while you have your appointment? Or mother/sister/neighbour/friend? Or if you'd pay for a babysitter for a night out, who not for during your hair appointment? Is this too simplistic a view? Let me know if you agree or not.