Personalized 4th Birthday Racing Rally Flags Toddler T-Shirt. 4 year old birthday party design with rally flags and race car cat says I'm four on this Toddler T-Shirt - Light Blue. 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.