Personalized Cupcake Polka Dots 1st birthday Women's V-Neck T-Shirt. Whether you're hosting a birthday party or just want to dress up your little one for their special day, this 1st birthday outfit is sure to make memories that will last a lifetime. 5.0 oz., 100% pre-shrunk cotton Athletic Heather is 90/10 cotton/polyester 1x1 rib collar with mitered v-neck Shoulder-to-shoulder taping Ladies' fit