Avent bottle question

DD has always had Dr. Brown bottles (after I stopped BFing) but now that she's on milk I wanted to switch to something without all of the parts. I bought Avent and I don't think she likes them. She's not drinking as much from them. I tried size 3 and 4 nipples (she was using size 2 Dr. Brown's). I notice it makes a funny noise when she's sucking. Is that normal? I really want to get rid of the Dr. Brown's. Cleaning all of those parts is so annoying. Any suggestions?

TIA.

Re: Avent bottle question

I started out with Advent and switched to Dr. Brown bc the Advent bottles leaked. I found the nippled to be very similar though. And yes, sometimes a weird noise happened when DD was eating. Like a wheeze or something - I cant really describe it well.