My daughter turned 4months old today. I was going to ask all you mommas when the regression started. At the beginning of 4months, middle or end of 4months. Well, I think it may be here. My LO went to bed tonight at 8:00pm and woke up at 12:00. Still trying to get her back to sleep as I type this. (Trying to get her to self soothe.) Wish me luck. To all the other moms going through it right now remember it’s just temporarily. (I keep trying to tell myself that.)