Some kids are energetic by nature, while others get restless only when they're bored.
Keep the wiggles at bay by giving children of all ages some responsibility during your ceremony and reception. Obvious role choices for children you're close to include serving as a flower girl, junior bridesmaid or ring bearer. Other kids who might be hurt they're not included in the festivities, or who just like to help out, can take on other tasks. Kids of all ages can roam the reception taking photos with disposable cameras. Older children can pass out wedding programs, party favors or cake on nonbreakable plates.
Whatever the role, dishing out a little bit of light responsibility on such an important occasion often leaves a child feeling appreciated and respected.