Personalized It's My Birthday Toddler T-Shirt. Celebrate with a huge birthday cake, balloons, confetti, and plenty of birthday presents! A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.