Personalized My first St Patrick's Day Baby's First St Patrick's T-Shirt. Make your baby's first St. Patrick's Day memorable with this unique design. It's not just clothing; it's a keepsake that will remind you of this special occasion for years to come. Gift it to new parents or add it to your baby's wardrobe for a festive touch. 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.