DD is 6 months and is starting to have some separation anxiety. The past couple of days, she'll cry after we put her down for a nap or bed, roll over on her tummy, pull down the bumper and look for us... crying until we go back in. It's actually kind of cute, but I try not to laugh or give into it.

She also fusses if we put her down to play and then start walking away.

What age did it start for you LO (if at all)?