Personalized Cupcake 3rd Birthday T-Shirt. Happy 3rd birthday toddler! Celebrate your little girl's third b-day with a pink bird, party balloons and a 3 candle atop a cupcake. Happy birthday three-year-old! Everyone loves our Custom T-Shirts! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.