The Hatley Cotton Coverall is a one-piece baby sleeper that wraps an infant in soft, 100 percent organic cotton. Because these infant pajamas are a single garment, there is no top and bottom to match up at bedtime. What Our Gearhead(R) Experts Are Saying:"At a middle-of-the-night diaper change, the full-length zipper opens the coverall end to end, so I can reach everything at once. I fasten the snap tab at the neckline last, and the baby goes back down."