Sleep help

LuckyClover13

My baby is sleeping in her crib now but turns from her back to her side to sleep and tries to get snug. At the same time she is sucking on her hands for comfort. She can't really sleep that well on her side yet bc her muscles arent strong enough. I feel like she needs to feel snug to sleep good like when she is in her swing. She sleeps in a gown now. How can I get her to sleep comfy and feel secure on her back? Any advise would be great