It's so hard isn't it? I don't think I could even leave Autie with my own parents for any length of time even though I'm sure she'd be fine. You just keep thinking about all the little things you know about your child that others wouldn't, and worrying that they'd be upset because no-one knew what they wanted. And of course, no-one can keep a better eye on your baby than you right? LOL I say go and have fun. Keep ringing to check up even if they start to sound annoyed! Write a big list - if nothing else, it will make you feel better.
