I reserved with my MSC concierge and asked that before I commit, I need to know that if my 6 kids does not need a passport. She said they do not; their birth certificate will suffice. My wife and I have passports. I tried to do the web check in and when it comes to my kids, it asked for their passport or ID. I can't continue checking in without filing them in. What do I do,? This is our first cruise.