Personalized 4th Birthday Outfit 4 Year Old Toddler T-Shirt. Funny birthday turtle wears a party hat and carries gifts on this 4th birthday Toddler T-Shirt - Navy 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.