I think you're safe. This is from a CPSIA pdf I just found in another thread...
______________________________________
Question 3: What is a children's product?
A children’s product is one designed or intended primarily for children 12 years of age or younger. Toys, clothes, furniture, books, jewelry, blankets, games, CDs/DVDs, strollers, and footwear may all be considered children’s products.
______________________________________
Cards, prints, and other printed material other than books doesn't seem to be applicable to an of these items...