I ordered two of the bodysuits - one in green and one in blue.  Based on previous reviews I was hopeful that they'd fit my 29 week preemie.  The newborn size bodysuits fit my 3-4 lb preemie fantastically.  The product itself is great....soft, fits well, and the design is great.  I liked not having to put it over his head (which, with his wires and tubes, would have been nearly impossible) and the double snaps (inside and outside) helped keep it on him.  No idea how they'd fit a newborn (and certainly wouldn't have fit my other kids who were 8 and 9 lb newborns!) which is why 4 starts instead of 5.