My 10-week old doesn't actively refuse a bottle, but can't seem to figure out what to do with it. She enjoys gumming at the bottle while cooing and smiling and will even open wide for the bottle but doesn't latch and doesn't try to suck-swallow. Is this bottle refusal or something else???

So far we've tried Playtex NaturalLatch and Breastflow, with similar results. I have a bunch of other bottles/nipples to try, but if she just fundamentally doesn't get it, will a different nipple will help???

I would love any ideas or suggestions! TIA!