U don't have to convince as u r the mother . It's hard to please everyone. As long as baby puts on weight and have enough wet diapers, u r doing fine. Tell them bf means to feed on demand and it's not as if u will not latch baby and deprive him/her when baby is crying for milk. Anyway just sharing...For me I went from latching to almost exclusively pumping as I'm a low supply mum and baby doesn't latch for long each time n doesn't empty my breast. Since I had to pump to keep my supply i decided to just pump n feed.
Just ignore. Believe in yourself. My husband been asking me how much LO drinks since birth. I just said i don't know. he is putting weight and growing well. So don't bother to know the volume