Personalized Bob is a Unicorn Toddler T-Shirt. Bob is, indeed, a unicorn. He just needs to believe it, and he can be it. Bob is a Unicorn Toddler T-Shirt - Natural, from the children's book "Bob is a Unicorn" by Michelle Nelson-Schmidt. 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.