Personalized 1st Father's Day Baby Boy T-Shirt. It's my Daddy's 1st Fathers Day T-Shirt - White has an adorable baby boy in a boat with blue heart sail. 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.