Personalized Body Builder Infant Romper. Bio Engineer, body builder text with a strand of DNA is a humorous design for biological engineers. Fun gifts for bioengineers at birthdays, holidays and graduation. Meet your new favorite outfit! Keep dressing simple with this one piece, lap shoulder t-romper. Super soft and perfect for baby's sensitive skin. 5.5 oz. 100% combed ringspun cotton premium jersey (CVC Colors are 60/40; Heather is 90/10 combed ringspun cotton/polyester)