Weddingbee boards

I don't think it looks rude, but if this is your way of telling them "no kids!", I don't think many people will get it.  Especially if you already gave them the OK.  If I had a baby, I would not expect the baby's name to go on an invitation, whether the baby was invited or not. 

I don't think baby names are supposed to be on the invitation regardless. I'm not positive how it should be worded (I'm not having babies or kids at my wedding), but I'm pretty sure etiquette dictates that it's supposed to read like this:

"Mr. and Mrs. John Smith and Family"

ETA: You can't be on the fence about this- you have to decide whether or not you are having kids at the wedding. Otherwise you are setting yourself up for a huge headache.

If you don't want to invite them, leave their names off. I wouldn't call it a "subtle" hint. In the world of correct form, if your name isn't on the invitation you aren't invited, and if you then show up anyway you are at best an "uninvited guest" and in unvarnished language a party-crasher.

Proper form actually doesn't allow either the phrase "and Family" or even "and Guest".

For a family with YOUNGER children you write:

Mr and Mrs Phipps
Sophie, Susan and Jacob

For a family with OLDER children you send the older ones their own invitations (but as long as they are at the same address you can put them all in the same outer envelope).

For "and Guests" you find out the guest's name and address and send the invitation directly to him at his own address.

You can check this out in "Protocol" which is the official protocol guide in the United States, or in "The Canadian Style" which is the closest Canada comes to an equivalent -- or you can just look in Miss Manner's Guide to Excruciatingly Correct Behaviour which says essentially the same thing.