Doh!! I *cannot* tell you how many times I thought of doing something like this after my first kid was born. I would tie my jacket around my waist and notice how much easier it was to hold the little nipper on my hip. Then I would think "what if someone (like me...) made something that was like a little foam pad thingummy that straps around you and makes a seat for the kid? Hmmm... what an idea..."
*kick self*
*kick self*
*kick self*
*ad infinitum...*