Personalized Happy Clam 3rd Birthday Toddler T-Shirt. 3rd birthday HAPPY AS CLAM 3 YEARS OLD I AM Toddler T-Shirt - Vintage Hot Pink with smiling pink clam in a purple shell blowing bubbles. 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.