Personalized Submarine Under Sea Explorer Newborn Layette. Cute little submarine Newborn Layette - Black under sea ocean themed gift for kids. 100% combed ringspun cotton 5.8 ounce 1×1 baby rib sleeper. 3/8" flatlock binding at envelope neck and cuffs. Back sleeve flap to protect hands. Elastic opening at bottom. Infant: 0-3 Months