might be a stupid question but...

Chloe
Ok so my 10 week lo is mainly breastfeed all though my oh gives her a bottle of expressed about once a day. She's still on the very first teats. He thinks we should start her on a bigger one but I'm worried that she might start to fuss is she doesn't get milk as fast from the breast as she does the bigger teats. Any suggestions? What have other mummy's done?