Personalized 3rd Birthday 3 Year Old Girl Outfit Toddler T-Shirt. This cute 3 year old birthday idea has a lion wearing a party hat for a little girl. 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.