Personalized Math Brain Infant Romper. Math Text with a happy brain is a humorous design for mathematicians, students and teachers of math. Fun gifts for birthdays, holidays, back to school 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)