I ordered these for my flat nipples a couple of weeks ago. Im 8 months pregnant and planning on breastfeeding exclusively. Within the first days use, I saw my nipples were already changing. Now that I have been wearing them for about a week only during the day, I definently see a change in them. I honestly believe that because of these, I will be able to breastfeed again. They are SOMEWHAT uncomfortable. Sometimes they make my nipples a little sore, to be expected I guess, but not painful. They do need to be worn under a padded nursing bra because they do change the shape of you boobs (mine are really big, so I guess thats probably why). Other than that, I love them.