Personalized T-Rex 1st Birthday Women's V-Neck T-Shirt. T-Rex 1st Birthday! A cute T-Rex dinosaur holds a bright red balloon to celebrate the one year olds first birthday! Adorable gift! 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