Personalized My first St Patrick's Day Baby's First St Patricks T-Shirt. Whether you're taking photos or just enjoying the day, this St. Patrick's Day outfit is sure to create lasting memories. Dress your baby in this charming apparel and let them join in the fun of this special holiday! 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.