I used it for about 2 months. The lactation consultants told me to because I was having such a terrible time with breastfeeding in the beginning. It did take him longer than a lot of other babies to transition off of it, but once he did he was fine and I went on to BF until he turned 1. The nipple shield was a life saver. He would have had to have been on formula without it (not that there's anything wrong with that).