Just when you thought you had things figured, here comes the Four Month Sleep Regression! WHAT'S HAPPENING?! Typically starting between 3.5m and 5m, this pesky little sleep disrupter is caused, as with all regressions, by a developmental leap. But, unlike the 8 Month, 18 Month and 2 Year regressions, this is purely related to sleep … Continue reading The Four Month Sleep Regression