Dr Seuss 1st Birthday Party Supplies - Invitations (8) Includes (8) birthday party invitations with envelopes. Add matching tableware, favors, accessories, or a party kit bundle to complete your Dr. Seuss party. First birthday design features classic Dr Seuss characters such as the Cat in the Hat among others! Great for kids parties, graduations, going away parties, farewell and retirement parties! Perfect for your childs birthday, sleepover or theme party!