Personalized Life's Ducky 1st Birthday Youth Long Sleeve T-Shirt. 1st birthday LIFE'S JUST DUCKY WHEN YOU'RE 1 Youth Long Sleeve T-Shirt - White with adorable baby duck. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)