I was just texting with a friend to see if she thought this was the right size for me, and thought I'd "poll" HB too.
Some background- I wear a 14/16, but probably more like a 14 on top, a 12 when I'm at my ideal weight. The L is 14/16 and the M is 10/12. I bought the breeze, which is half mesh. Effie is 4 weeks old, and 8+ lbs (I'm guessing).
I am not a huge fan of the half mesh. I thought it would just be a more breathable fabric but the mesh half is like basketball shorts material and thus, slippery. I would worry having that fabric around her, so I put that on my back. The regular fabric though seems to kind of slip and slide too.
I'm attaching pics in a moment in comments (they're on my phone) - basically I followed all the instructions/videos I found for newborn wearing. And she didn't feel super secure. Granted, I've never worn a baby before having Effie so I don't know what a "successful" baby wearing feels like.
It seems like there is extra fabric on the shoulders, which restricts my movement. The fabric in general just seems excessive. But I haven't washed it yet. Not sure if washing it will tighten it up a bit, or if I should go down to a M? Please let me know what you guys think from my description and pictures!