We specified no children when we had our wedding. Those that mattered didn't mind and the one person who minded didn't matter... we were secretly relieved when she declined to come in a great big song/dance & huff.
Ours was a small wedding and my husband and I felt quite strongly about not having children there.
I have been to one wedding with my dd and that is only because she was invited and it was a daytime wedding starting at 9am. We left mid afternoon (she was about 15 months at the time) and I chose to go home with her while my husbad went onto the evening celebrations elsewhere.
I wouldn't dream of taking either of my kids to an evening wedding at their current ages (3 years and the other 5 months). I'm happy to stay at home with them while my husband goes.
If we had a regular babysitter (such as a grandparent) I'd consider leaving the kids at home with that person and going... but not at this stage because my bub will only drink milk from me not a bottle.