Re: what age did you leave child overnight?
DS didn't sleep through the night until he was about 15 months, so I figured it would be upsetting to him and just as importantly tough on a caregiver if he was waking up expecting boob. Then, it took us a couple of months to plan a weekend away, so DS was 18 months when we left him overnight at my mom's house (for two nights in a row). He was totally fine. I would love to leave DS2 overnight so I could get a good night's sleep - he is up all the time!