Personalized Las Vegas 16th Birthday Toddler T-Shirt. Las Vegas sign 16th birthday Toddler T-Shirt - Heather and Royal says IT'S MY FABULOUS SWEET 16TH BIRTHDAY. 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.