Personalized Blue Monster 1st Birthday Toddler T-Shirt. A blobby blue monster holds a yellow balloon and wears a bright birthday party hat as it celebrates the one year old's 1st birthday! 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.