Disney's Cars Birthday Outfit for Boys. Boys Lightning McQueen's 1st Birthday Outfit (Matching Cake Smash is also available on a separate listing) You choose the pieces that you want and leave a message stating the size that you need. Sizes 6/9 months upto a size 4. Need a number other than a 1 on your shirt? Or birthday hat? Leave that info along with the size while checking out. Half Birthdays are welcome.