Due to some financial issues I wasn't able to buy my pump until this past Friday. I brought the Ameda Purely Yours, and tried it out. Ouch! The flanges look really big, although I wear a c bra. After pumping for about 10 minutes my breasts were so sore. I read the directions exactly, and did not begin on a high suction level. So I have been pumping since Friday and my breasts are so sore, and I have a headache. I am so sad because I have to return to work tomorrow and I only have three 4 ounce bottles. My son is now 15 weeks and weighs 18 pounds. He is very healthy and I never had a problem breastfeeding. I tried the Avent pump, but it takes a long time to get any milk. For his weight I want to leave four 6ounce bottles, because I will be working form 3:30 to 12 am. Once this weekend I was able to get 4 ounces in 10 minutes when I nuresed him on the pposite breast. I don't know what to do. I put in the the Avent silicone insert into the Ameda flange, and it felt so much better. Also, when I am with my son my milk let downs very fast, but I can not with the pump. Is it suppose to hurt this much? The flange fits, but this is so uncomfortable with its tugging and pulling. It feels so unnatural. I try to relax and massage my breasts, but it feels so abnormal. Please help as I am returnig to work tomorrow.