Oh chicky, I know you are disappointed atm but good things are he is getting some breastmilk or his poos wouldn't have been yellow before you introduced the comps, true, pumps are not the best guage - some people can pump milk like a dairy cow but others can't get anything or can just get what's in the fore breast and not fully milk the breast like a baby that is sucking well so you prob still have more than 60ml over 4 hours, and it sounds like the topups will help him wake up a bit and take better feeds etc. When I had to put my girls on top ups the MHCN said to think of it like medicine - if our bubs were sick we would not feed badly about giving them some medicine to improve their health, and that is the same when our supplies are legitimately low - it's medicine on top of the booby goodness to help our bubs grow.

My suggestion is not to offer a top up after every feed because it makes them go longer between feeds (since formula is heavier to digest) and if you can't express much between feeds it will be counterproductive long-term. I've found offering one or two bigger top ups in the day keeps DD gaining weight well as well as helping her settle and still demand lots of breastfeeds (I know for me motillium takes a good couple of days to kick in but have to have that increased stimulation for it to work it won't just automatically increase on its own kwim) Hope it kicks in for you soon 'mar.