I've been invited to a wedding in June, and my baby will be about 4 weeks old. We've been told that I am welcome to bring her to the wedding, but not the posh reception. As I hardly know the couple getting married (uni friend of my husband) going to the wedding is a bit irrelevant if I can't meet anyone afterwards.
I do have a tiny bit of sympathy for people who won't have toddlers/children at their weddings (although I invited kids to mine - I think they make it a happier occasion), but I thought it was a bit harsh to exclude breastfeeding babies (and their mothers)...