Size of the neck hole could be a little tighter, because he still gets his arms out, but the quality of the materiel is magnificent. I love the design of it.
There needs to be a medium size. Our baby is too big for the small but too small for the large. Also he will probably roll soon rendering the large size swaddle unusable.
My little one really doesn’t like to be swaddled and the sleep band is uncomfortable for her. I wish the sleep sack came in a smaller size. This product does measure her breathing when she will actually stay in it. Definitely doesn’t work for babies that don’t like to be swaddled.