Personalized Rocket Scientist in Training Toddler T-Shirt. Rocket scientist in training childs future occupation Toddler T-Shirt - Vintage Smoke for girls or boys with graphic c. Ne Metzger 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.