Personalized 7th Birthday Rainbow Toddler T-Shirt. 7th Birthday Rainbow Toddler T-Shirt - White and Black has cute pink number 7 with clouds, hearts and rainbow logo you can personalize for a girls 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.