Personalized 5th Birthday Space Rocket Boys Toddler T-Shirt. 5th Birthday Boys Rocket Ship Toddler T-Shirt - White and Black in striped blue and white with number 5 on this space themed bday gift. A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.