Personalized 1st Birthday Pink Cupcake T-Shirt. Our 1st birthday girl and boy outfits come in a variety of styles and colors to suit your preferences. From cute tutus and bow ties to comfortable onesies and rompers, we have everything you need to dress your baby in style. Let your little one shine on their first birthday with our charming outfits that are designed with both comfort and cuteness in mind. 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.