I read some good advice that has stuck with me. I think it was in Sleeping Like A Baby. It was about the difference between women & the amount of milk their breasts could hold. Basically, each woman will usually produce what the baby needs but their breasts might have different holding capacities. Some women who have smaller holding capacities think they have low supply when in fact they just need to feed baby more often. A simple analogy - You can drink a litre of by having 4 drinks of 250ml or 10 drinks of 100ml. It's still a litre just from a different cup. I found this advice helped me through when DD was wanting to feed every 1 - 2 hours during the day & 3 hourly overnight. Also, I could never express either. Whenever I tried I'd get about 20ml after 1/2hour & sore bruised nipples. My babies were gaining weight so I knew they were getting enough. From my understanding (I'm not an expert), as long as baby is gaining weight, the amount doesn't matter. Some babies are just smaller than others. And it can vary based on things like - just had/due for a feed, just filled/about to fill a nappy. I hope your friend gets the help she needs.