Personalized Robot 4th Birthday Toddler T-Shirt. Little robot 4th birthday I'M FOUR Toddler T-Shirt - Navy with cute robot, stars and red planet with the number 4. 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.