Baby Toddler I am 4 Years Old Cars Vehicle Transportation Birthday shirt 110CM/116CM (4-6 Years) 40% polyester Super comfortable boutique fourth birthday/fun t shirts for boys in transportation applique. Short sleeve shirt Accented with an adorable applique these birthday boy tee shirts are available in all sizes so you can find the perfect fit. Ages 1, 2, 3 and 5 60% cotton 40% polyester. Ages 4 and 6 88% cotton 12% polyester. Transportation Theme