Personalized Robot 6th Birthday Toddler T-Shirt. Little robot 6th birthday I'M SIX Toddler T-Shirt - Football Blue and White with cute robot, stars and red planet with the number 6. 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.