@Daniella I found this too with mam bottles size 3 were so fast for my little one and size 2 was getting too slow. I was looking at the advents bottles. I might give them a go this time around
They really are good and you can get all the bits on Amazon too
I used MAM when my baby was born and they were great up until size 2 tests and then I found it was taking so long for her to feed and she was getting frustrated but the size 3 were super quick! So I changed to Philips Avent and find them great! Bonus points for quick and easy washing up as there is way less parts!