Choose the set that you want and PLEASE remember to leave a message while checking out stating the size of outfit that you need. Sizes available: 6/9 months upto a size 4. Girls Sesame Street 1st Birthday Outfit, Cake Smash Outfit for Girls in a Sesame Street theme. If your little one is head over heels for Sesame Street, then she will be super excited to see that she gets to wear a Sesame Street outfit with her favorite characters on it. Elmo - Cookie Monster & Big Bird next to her new age number. Plus, the bright colors are fun & cheerful as well which is perfect for a birthday celebration.