Elisabeth at Helsinki Dragonfly
recommends the Magic Sleepsuit and asks/answers the question: "So what's the magic? According to me, the three secrets of the comfortable fleece suit is that it helps muffle reflexive startles, it eliminates the need for blankets and it's designed for back sleeping in the crib!"
LittleList.com. included the Magic Sleepsuit in their Ultimate Registry Guide. Find their recommendation in the Nursery section as a product that "really helped us with sleep".