Personalized It's My 4th Birthday with The Whatif Monster Toddler T-Shirt. There's no day like your birthday, so why not try something new? It's My 4th Birthday with The Whatif Monster Toddler T-Shirt - Royal, perfect for little fans of "Jonathan James and the Whatif Monster" 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.