Personalized 1st Birthday Puppy 1 Year Old Boy T-Shirt. celebrate babys 1st birthday with this adorable dachshund puppy carrying a balloon 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.