Personalized 1st Birthday Puppy Blue Youth Long Sleeve T-Shirt. I'm one! A cute blue puppy dog with a birthday hat and a cupcake with a 1 shaped candle. Happy 1st birthday to the one-year-old! youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)