Personalized Sassy Since Birth T-Shirt. Sassy since birth apparel and gifts has beautiful and playful elements such as owl with boots, bird, and quirky small critters. Click on the tabs to choose the product that you wish this design to be printed on. 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.