A: Once you open up the guest list to kids outside of the wedding party, you've got to invite all guests to bring their offspring (though not everyone will want to) or make a strict age-related cut-off (no children under five, for instance). To corral the young ones, set up an on-premises nursery overseen by a baby-sitter(s) recommended by a friend or by your officiant. You won't save any money (you'll have to pay the sitter and feed the tots), but you will take a load off guests' minds and preserve the atmosphere you're after. When you write out the invitations' inner envelopes, list the names of every person who is invited, including the children. Include a printed card that says there will be a supervised children's room.