how old is your baby Emma? Can you give a bit more detail on slow weight gain? ie birthweight current weight, growth profile. maybe tiktok or mears will see this thread and have more advice with a bit more info.
in the mean time ask yourself, is you baby weeing and pooing enough, does he seem alert and content?
amt expressed is not an indication of milk supply. type of pump or manual expression also plays a role in how much you may get.
but to answer part of your question, fenugreek makes your sweat & breath smell like maple syrup. you are to take 1 capsule 3x a day on the first day. if your BO doesn't start to smell, increase on day 2 to two caps, etc. when you start to reek of maple syrup, you have the correct dosage.
I think the other poster may be talking of fennel tea. Whether or not it boosts milk supply, i don't know but its been used historically in a few places for that. I have drank it and it is lovely and refreshing and made me relax and stop worrying about all the things being a new mum made me stress out about. Plus you can always use the extra water.
Whether or not this is useful to you, it may be heartening to hear that my dd bf every 1.5 - 2 hrs right up to when she started to eat properly. She is a petite thing with bags of energy who never took the second breast when offered till after she was very active (over 10 months?).
sorry didn't mean to be wordy. off to make some supper.