Personalized 4th Birthday Boys Police Car Policeman Women's V-Neck T-Shirt. Cute 4 year old birthday Women's V-Neck T-Shirt - Aqua with police car and I'm four quote for a little boy turning 4 years 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