Try not to stress little_o, my DD used the nipple shields from 2 weeks to 5 months. I too thought she'd never come off them, worried there was something wrong with me, with her, with my milk. Everything was fine. I would offer her the nipple every feed, and then put the shield on if she refused. Also tried giving half a feed then taking off the shield. At the end of it, it happened when she was ready. And we never looked back. Some periods of time were too stressful to even bother offering, so I wouldn't. Don't pressure yourself or her :) What shields are you using? I tried a few and settled on the Medela ones. They were by far the thinnest shields I tried, and they had a cut out so baby could smell your boob, not plastic. I never had any supply issues or any issues from the shields :)