Personalized Race Car 3rd Birthday Toddler T-Shirt. Cute Race Car with the number 3 on it for your little boy's 3rd Birthday is fun and colorful and comes on a party Toddler T-Shirt - Heather and Red gift. 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.