Hi guys

Am a first time mom, what is the solution to flat nipples. My baby of 3 weeks is having difficulty in sucking the nipple. The one he loves to suck sometimes will cause sores on the breast. He has been refusing to take breast now. I was told by my nurses that is poor positioning, have worked on tge positioning but am still experiencing the same problem. I have been pumping using my hands and ojt inside feeder for him to feed and is a bit stressful. What is the solution to this guys?