Breastfeeding/bottle

Rach • Mum to two beautiful girls 2&0 🥰💗

Exclusively breast fed baby girl not gaining enough weight. Midwife has advised that I express an ounce each feed and give via a bottle. Been trying this since yesterday, myself and my husband, but she refuses the bottle. I’ve tried different teets too. Has anyone got any tips on how to transition to bottles to make this a bit easier? I’m worried as she’s not gaining weight, and now worried she wont accept bottles 😞