Girls, anyone used these bottles? From ComoTomo. We've been on mixed f…

Girls, anyone used these bottles? From ComoTomo. We've been on mixed feeding for almost three months now. She was sucking from a regular Babyland bottle but lately she's struggling with her own bottle. I don't know if it's hard or what. She's only ever fed from this bottle since birth. Maybe we should change the bottle? And even breastfeeding is difficult for her. Could there be confusion?