Personalized Superhero 4th Birthday Women's V-Neck T-Shirt. This kid is Four! Celebrate your child's second b-day with this cute thumbs up 4th design. Happy Birthday 4-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