Personalized Valentine I Love You Daddy Youth Long Sleeve T-Shirt. Valentines Day Youth Long Sleeve T-Shirt - Royal Blue outfit for baby with big heart that says I love you Daddy. Also appropriate to tell a Dad to be that baby is on the way. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)