I have a dilemna. We are having a formal wedding ceremony and while children are invited, we only have one family that is invited who has a baby under the age of two. We addressed the invitation to Mr. and Mrs., but not the baby (hoping they would take the hint that she is not included). I received their RSVP today and they informed us that their 7 month old will be coming to the wedding with them. We really do not have the money to hire a babysitter but we also prefer not to have the baby at the wedding. How do we let them know politely that the baby is not welcome?