I tried something different for my DS. I was initially doing single sided feeding when he was small, but started doing double sided as his needs increased, and he started having more green poos.I read somewhere that if you start one feed from the right side and then go to left, then start the second round of feeding from the left and then go to right, so that if LO has not emptied the second breast earlier, he does so in the second feed and gets hindmilk. This seemed to work for me as his poop has turned more yellow, though still occassionally has green poos.