I'm a first time mom and baby is 3 months. I've been trying to pump some but I can't get anything. In the mornings I can get .5oz total but in the afternoon I won't even get a drop. I have a brand new medela pump in style backpack. I think that the flange fits based on diagrams I looked up online but honestly I don't know for sure. Could be supply issue...I'm a stay at home mom so it's not absolutely necessary, however, I feel so tied down feeding all the time and it would be nice to be able to give a bottle on occasion and I would like to have a small freezer stash.