my oldest sttn around 11 months, and regressed when sick or teething (which I expected!). however she goes through cycles of being prone to nightmares/long night wakings for a few weeks, then a few weeks of sleeping like a rock straight through (she's 3.5 now).

my youngest is 13 months and is still waking often. ever since we moved this past summer her sleep went from 1 wakeup to anywhere from 2-10. gah. hoping she starts soon..