I have! My first DD didn't start nursing well until more like six weeks. I still pumped some until 9 weeks. I actually didn't do much trying to get her to latch until 3-3.5 weeks because she was having real weight gain issues when I tried between 1 and 2 weeks. I was more concerned about getting my supply up and milk into her until then. If you have any questions for me, please ask! It was almost 6 years ago now, so my memory on details may be a bit fuzzy.