Transition from sleeping bag to duvet?

cherry

My daughter is outgrowing her sleeping bags and I'm feeling anxious about transitioning to a duvet because she moves around SO MUCH. Like she changes positions constantly - she sits up turns around rotates etc and I'm worried that she won't be able to stay under the duvet! Anyone else made the switch with such a mobile baby? Or any recommendations for where I can find sleeping bags for 24months + in the UK is also welcome!