Personalized 3rd Birthday Teddy Bear Youth Long Sleeve T-Shirt. 3rd Birthday Teddy Bear - A cute stuffed teddy bear is throwing a birthday party with balloons, noisemakers, confetti, and a birthday party hat. Cute gift for your little 3 year old! youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)