Personalized 4th Birthday Party 4 Year Old Boy Women's V-Neck T-Shirt. Childs cute four year old birthday design has bear riding a bicycle with hooray Im four quote. 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