Personalized Me 1st St. Paddy's Day Youth T-Shirt. 1st St. Patrick's Day Youth T-Shirt - White with a cute baby wearing a diaper in a green T-shirt, holding a shamrock rattle. He says IT'S ME FIRST ST. PADDY'S DAY. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.