Personalized Penguin 1st Birthday Long Sleeve T-Shirt. A cute little penguin wearing a winter hat is surrounded by birthday presents. A red balloon announces I'm 1! Cute 1st birthday gift for your little one year old. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL