Hi, baby is tongue tied, and while we get that sorted, have been lent a pump to try to keep the milk I have at least (he can't use his tongue to feed at all really so just squeezes with lower jaw to get milk). Using that, I think I know why he only feeds for 15 mins! When pumping I get about 40ml combined from both breasts and this comes in the first 10-15 mins. Then nothing. Even if I give it a decent break, or a shorter break, or... there's just nothing left. If I feed on one breast and pump the other, I get 30ml from that one - but again, only for 10min.
So - what can I do to increase supply? He has to have formula top ups as we've had massive issues with weight, but I can pump to get extra stimulation and give him the expressed milk (still wouldn't be enough, but helps!). I don't know if it's relevant but even with milk in them my boobs are only about an A cup - so not large at all.