Personalized 3rd Birthday Mermaid 3 Year Old Girl Women's V-Neck T-Shirt. Cute mermaid themed 3rd birthday outfit for a toddler girl with number 3 design. 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