We are all different, but I use my carrier because it is much easier on my back than carrying in my arms and some little ones are more soothed by that than anything else, especially if that is what they are used to. But, of course, if that is not something you can do, then don't. It is your business and you run it the way you run it. The parent should have discussed this with you before she signed on. It doesn't sound like a very good fit