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Some of the pictures here show older prints, now discontinued, but the 4.0 design remains the same so these pictures still show how it fits.

Huge selection of prints and colors. Free shipping over $49. Soft organic fabric inside. Beautiful prints and colors.
I think this is set too snug. I would set the top snap out one more snap to make it wider and thus more comfy for baby. The top and bottom snaps do not have to line up. You can stagger the snaps. That is, you can snap them one-off from each other at either the legs or the waist. Having two rows of snaps allows you more adjustability to get the legs and waist just right.
It is adjustable so it does start fitting well on a young baby as you can see this picture of Tweetheart, but I don't recommend this or any other one-size for a newborn unless you are ok with bulk. It's a lot of diaper for a newborn baby (as are all "one-size fits most" cloth diapers, really).
The organic cotton inside is very soft and the new 4.0 version is "pre-prepped" so it doesn't need much prepping. Most of the natural cotton oils have been washed off at the cotton manufacturing stage of production. The insert (or doubler part) is attached at the back and it is long. Fold it in the manner that works for your baby's age and size.
Back to Smart One 4.0 AIO Diapers