Love to dream swaddle?

I am considering trying this swaddle. My daughter doesn’t like to be swaddled. She wants her arms out, but then she chews on her hands (even when not hungry).

I worry about getting the wrong size. I know the sizing says the small fits up to 13lbs, and while my daughter is only about 9.5lbs currently, she’s very long, at about 21.25 inches.

Should I go for the medium? Also, has anyone had success with this?

The moment I swaddle her and lay her in her bassinet, she starts wriggling and whining and trying to escape. Then we get zero sleep. 🤦‍♀️