Personalized Nuclear Eggineer Newborn Layette. Eggineers are engineering eggheads. Nuclear Eggineer text with an egghead surrounded by a green glow and holding a Geiger counter is a fun gift design for holidays, birthdays and graduation. 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