Personalized 4th Birthday Cute Penguin Toddler T-Shirt. 4th Birthday Toddler T-Shirt - Turquoise has cute penguin in a party hat with the number 4 on its tummy for your child's fourth birthday celebration. 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.