Personalized 1st Birthday Monster Toddler T-Shirt. 1st birthday monster Toddler T-Shirt - White. A cute monster holds a bright yellow balloon to celebrate the one year old's first birthday! Great gift for your little monster! 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.