It's different for everyone. The main thing is to not make assumptions either way. I'd talk to the bride. If they're adamant that there be no babies, then I'd not go, unless you have a family member who can look after bub. They should be able to accept that.

Whilst planning our wedding, I took into account there would be small children. We had a flower girl and page boy (brother's kids, 4 & 8) and teenagers. 2 friends would only be able to come (from interstate) if they brought their small children. Only 1 could make it, so we had an 18 month there. I just asked the parents to take him out during the ceremony if he started crying. The poor lamb was tired from flying down the morning of the wedding, but he was very good. We also provided bags with toys/colouring books for the younger kids to play with. We thought about hiring a babysitter, but then found we wouldn't need to - the parents were happy to look after them. The venue even had a highchair for the toddler and his meal was free. We didn't invite older children of friends, just family. We didn't have the room.

Whilst many bride's try to accommodate their guests, it is their day (& the groom's ), so their rules. As a bride, you can't please everyone and the whole thing is very stressful. It's up to you what you choose to do, but if they don't want kids on their day, then work around that to what suits you the best. And try not to take it to heart.