Personalized 1st Birthday Cowgirl is One Youth Long Sleeve T-Shirt. Cute pink and black cowboy boot Youth Long Sleeve T-Shirt - Royal Blue for your child's 1st Birthday has quote that says This Little Cowgirl Is One. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)