Baby sleeping help!? (:

Gabriele

So my baby has been sleeping in a swing over night .. she loves the be propped up not laying flat. The only way I can get her to sleep.... I’ve tried transitioning slowly for naps I’m her crib and I noticed she gets startled jerking her arms up and it keeps waking her up. She doesn’t do this I’m the swing and sleeps great. How can I get this to stop? And her like to sleep flat? Cause eventually soon enough she’s going to have to.