Personalized 1st Birthday Monkey T-Shirt. The vibrant colors and charming illustrations make these items a wonderful keepsake for this special milestone. Celebrate your baby's first birthday with our adorable monkey-themed products and create memories that will last a lifetime. 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.