clam is it not the case though, that if you want to participate in the most important day of someone's life (and I don't think my wedding was by the way), that you attend the event to which you invited, in the style in which you were invited, and that if you don't like it/it doesn't suit, don't go?!
I would have loved it if there were no children at our wedding. Yes, DH and I planned the wedding we wanted and honestly, it wasn't a suitable event for small children. And I do love his nieces and nephews, but I didn't particularly want them at the wedding, nor did he, and I think they were bored out of their brains by the whole event. Even his sister's wedding a while later, which by the way had tons of children at it, and was a lovely day, wasn't a "child friendly" event imho.
I have two children, both of whom were breastfed. Wouldn't have taken either of them to a wedding. In fact, they were invited to a couple, and I didn't take them and in one case, didn't go myself. Now they are slightly older and I still wouldn't take them to a wedding. The idea of trying to entertain two toddlers at a wedding makes my blood run cold.
If I were the OP's friend, I wouldn't go to be honest.
I don't get the vitriol that comes on MN with this topic. But I suppose that's as I don't get why you would want children at a wedding. Had one, been to many, and have two of the most adorable, smart etc, etc children and still don't get it.