Personalized 1st Birthday 1 Year Old Girl She is Fierce Youth Long Sleeve T-Shirt. Cute babys first birthday design says and though she be but one she is fierce on this adorable Youth Long Sleeve T-Shirt - Royal Blue for girls youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)