Personalized 3rd Birthday Party Fish Toddler T-Shirt. 3 year old birthday Toddler T-Shirt - Heather and Royal has I'm 3 3rd birthday party slogan and funny blue fish 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.