You're not being a baby! This is an important event in your life and you have the right to want to share it with people who are important to you. She will come around, and there is no reason not to bring a baby on an international trip, we just went to Mexico with our family, and we had a 3 yr old and 5 month old nieces with us. No problems whatsoever. Just don't pressure them, it's a long way off and anything could change. I would probably not want Doug to leave me with a new-ish baby either, but then I am the type of person who wouldn't think twice about attending a DW with new baby, if invited. Try not to stress, it will all work out