Personalized Baseball Irish Shamrock Infant Romper. A green baseball with the imprint of a shamrock is a unique Irish themed gift design for baseball players and fans on birthdays and St. Patrick's Day. 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)