The romper is absolutely adorable.  I ordered 0-3 months and it fits on my 11.5 lb son. (7 weeks old)
I am giving the BabySoy Romper 3.75 starts (or 4) based on the fit - and the feel of the fabric.
The outfit has been washed twice and still looks new, the fit is great around his upperbody and middle. The only real issue is the crotch area.

The romper is "short waisted" leaving a snug fit around the diaper. My son is of average size (22") and the romper won't be able to be worn too long into the warm months ahead due to the length. Also, there are 5 snaps - causing the crotch to gap between snaps.  Two snaps in the center would have been ideal.

-- All that said - I am searching now for another "outfit" as I do love the weight of the fabric, the prices, and craftmanship (minus snap spacing).