Personalized Penguin 2nd Birthday T-Shirt. Penguin holds a birthday balloon with a 2 on it. Cute on a t-shirt! Happy 2nd b-day two year old! Everyone loves our Custom T-Shirts! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.