Personalized Submarine 5th Birthday Toddler T-Shirt. THINGS ARE LOOKING UP 5th birthday Toddler T-Shirt - Heather and Hot Pink with big number 5, colorful submarine, little deep sea explorer in the porthole and bright fish with 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.