I'm in the same situation, except it's my fiance's sister. She's having a C-section at the end of October and our wedding is in December. The baby will be about six weeks old. She's told us that she's not coming to the wedding, and I'm so heartbroken/angry/upset/frustrated over this. I don't have kids yet, so I don't know what it's like, but I just feel like if she really wanted to be there, she'd be there. There will be so many people who can help her and help the baby if she needs. I think she's worried about bringing the little baby on the airplane mostly. I feel like a bad person for feeling the way that I do, but I honestly can't help it. She KNEW she was pregnant when we got engaged and were planning a destination wedding and she didn't tell us until after we had booked it and sent out all the info to our guests.