I'll be brave on this one and be the first to comment, this is your ceremony, most parents would understand that if they had time to know in advance, as in the invitation that the wedding is an adult only affair, they would make arrangments for small children and babies. I think time, and notice are key. Afterwards it would seem awkward it wasn't stated in invitation in a tactful way.
What is the best way to ensure that no children attend our wedding/reception?
