Personalized Cowboy 3rd Birthday I'm Three Toddler T-Shirt. Cowboy 3rd Birthday Toddler T-Shirt - Pink has cute striped number 3 with cowboy hat and lasso for your little cowboy's special birthday party. 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.