Ok so this more of a bottle feeding question but it is closely related to bfing so I'm putting it in that board (seems to be where I post everything lately!)

We are introducing a bottle for the first time, and I have the comotomo and born free bottles to start with. DH tried twice now to give her the comotomo bottle and she is flattening the nipple in her mouth and not getting any milk. She has a very aggressive suck at the breast (even the lc at the hospital was impressed!) So I'm wondering if she needs a more sturdy nipple?

I'm not sure if this is just a matter of her adjusting to bottles v the breast or if this is an issue with the bottles I'm using? Maybe she needs a harder nipple or something? He tried the born free tonight and the born free nipples are a little longer so less flimsy, but dh said he thought she preferred the shape of the comotomo bottle because the top is shaped like a breast. Either way though she's only taking half an ounce at a time so far.

Anyone have this issue? Should I try different bottles or keep at it with these a little longer? Obviously I don't want to buy every bottle on the market here! But I'm not sure if this is something she'll adjust to with time?