Personalized Mermaid 1st Birthday Women's V-Neck T-Shirt. Mermaid 1st birthday! A cute little mermaid celebrates your first birthday with her fish friends. Cute gift for the one year old. 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