How to say this tactfully?

Thanks for all of the ideas! I am really not sure why some people got so offended, after all it is MY wedding.... We do think children are a blessing, it's just not something WE want to deal with during our wedding day. If I had kids and was told that it was an adult-only celebration I wouldn't be offended. Not only is a wedding expensive, but as stated above sometimes it's just safer and easier to not have to worry about it. People who have kids don't really see the things they do as irritating bc they are their children. I really don't plan on accomodating people who go against my wishes, since we are paying for it so we should get to plan accordingly.

The bottom line is: find a babysitter bc we don't plan on babysitting during our special day.

Good move, because I neglected to specifically state that however I did properly address the envelopes but I still had some people add their own guests/children!

BTW I do have a 2yr old and an 11 yr old sister who are both in the wedding. They will most likely be the only children at the wedding if my fiance's brother doesn't bring his 3 children. I don't mind a small number of well behaved children but it is still expensive to feed children who probably won't eat anything anyway.

I also dont want any children except for those in the wedding which one of the ring bearers is my 1 yr old son so im sure there might be a lil whine but hopefully he behaves like he usally does when he's with my mom. I did put adult ceremony & reception on the invitation but some people think they can bring their kids to the ceremony and not the reception

I don't have the same issue, because the youngest are in the wedding party.

BUT I say the best thing to do is address it on the invitation as other said. Put "Adult Ceremony and reception". My friend did that, and no one was offended.

Also, you'd be surprised at how many people don't want to bring their kids. LOL I know I would be like "Wooo a night without the kids!"

The only children that are going to be at my wedding are the ones in the bridal party and the children of the bm/gm in the bridal party. We have a children's table at our venue and our venue also provides for free, chicken tenders and french fries for the children.

Well, I guess I'll be the meanest about choosing to not have kids at the wedding Not inviting my niece, nephew or my FH's kids no matter how much I love them all. MOH is pregnant and wants to bring her 6 week old to the wedding. I told her no even though it was VERY hard to say. If people RSVP back with children or 4 instead of 2 (that aren't in the bridal party), send them a little note saying you appreciate them wanting to bring their children but that it is adults only. Carrie, kudos to you for sticking to your guns!

We are having 2 children in our ceremony but are leaving to a babysitter after pictures before the reception

But how do you say it tactfully when someone calls ans asks even if you specified adult only and said we have reserved 2 seats in your honor.