I used one of these for a couple weeks until my son was strong enough to latch on his own and got the hang of breastfeeding. they work amazing and stick everytime you use them. the hospitals have them in different sizes so you should wait and get one for free...or three lol I took a bunch home with me :)
I haven't but y friend has and her experience is that now that she used that the first couple times she can't get her baby to latch on to just her. she has to use it every time now.