Personalized Shamrock Music Notes Infant Romper. A shamrock comprised of green music notes is a fun design for family and friends during the March holiday of St. Patrick's Day and Celtic festivals. 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)