Personalized Monkey First Birthday Toddler T-Shirt. It's my first birthday! This cute little monkey is celebrating his 1st bday! Happy birthday 1-year-old. 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.