Personalized Coolest Nuclear Engineer Newborn Layette. The world's coolest nuclear engineer text and a snowman surrounded by a green glow and holding a Geiger counter is a funny design for engineers at birthdays and holidays. 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