If you have made up a 6oz bottle then that's what it is even if the volume increases - there will be 6oz of fluid and 6oz worth of calories and nutrients in the bottle.
Ha ha I knew this question sounded mad! I know there is only 6 ozs in the bottle but because the liquid thickens 6ozs looks like 8ozs so therefore if he takes what looks like 2ozs maybe its just 1oz.....oh its hard to explain! ha ha ha

We use the variflow on the mam bottles, we had been using the sz 3, which is pretty fast and tbh I think he variflow is only a wee bit faster for him. Oh I like the sound of the 3 levels on the avent variflow, I may check it out. My SIL uses avent so maybe i could borrow a bot and save some pennies and just get the teats.
He has had 21ozs today so far & I am still DF'ing, he normally takes 5 ozs so his intake is okish today. I spoonfed breakie and BLW the rest of his meals, I am sure he didnt get much in during lunch, but he defo ate well at dinner time, (all finger food).
I was thinking about dropping the DF but I am worried he wont make this milk up in the day and miss the calories.
I try to let him lead the way, but its tough when you feel they arent getting what they need.
Lolly thank you so much for the info I think I may scale the solids back, maybe the solids are a bit novel at the mo so he is stuffing his face maybe when he gets bored of them his milk will return to normal.....we'll see. Thanks again! x