Children t-shirts are all made from 100% Cotton. Sizes are 1-2,2-3,3-4,5-6,7-8,9-10. We can do Boys sizes up to 13 years old, and for Girls age 11 and 12 we have Female size 8 or size 10 depending on size of child. We are happy to assist you on any questions you have about this so please ask us at contactus@auraplusshop.com