I am pumping using the Medela Swing. My first time after about 15 minutes I got 1/2 oz and the second time 1 oz. Now I am not getting anything! My milk lets down but after the initial let down, nothing. I am pumping to increase milk supply and provide supplementing. I only pump after he has eaten his fill. I am very concerned about milk supply as my LO (15 days) is 5oz below his birthweight. The dr. said if he isn't up to his birhtweight next week she is going to recommend supplementing with formula!