Personalized 3 Year Old Birthday for Girls Rainbow Unicorn Toddler T-Shirt. Delight a little girl with this rainbow, hearts, unicorn design for a 3rd birthday party or photo keepsake 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.