Slow bottle feeds and teat flow?

Jesse • 2 years trying, first IVF cycle success now raising a wild little gypsy 🌸 follow my instagram - spiltmilkmum😊 and my blog for all the parenting &!IVF truths I have to offer

Hi everyone!!

My 11 week old is bottle fed but she takes over an hour to feed every time and a lot of the time she leaves milk behind!! She is meant to have 180ml and just now has taken 45 minutes to drink 60ml!! She falls asleep on the bottle of an evening after finishing less than 100ml too so now I'm wondering if I should be changing her teat to the 2- medium flow teat? Any advice would be great!!