Quoting Mrs. Dahl:" My LO does the same thing. I've noticed, that even if he's playing and all happy, as soon as I leave ... [snip!] ... because it's like he thinks I'm going to leave him. He's 5 months old but this has been happening since he was about 3 months."Same here but he started at 2 months. I was in the hospital feburary and march for about 3 days each month and I ebf and cosleep so he was with his greandma and once he seen me if I left his sight he would cry. I guesss he thought I would leave again.