I have the same situation with clingy, 3 yr old dcb at drop off. He's had behavioral issues lately, but nothing major. As far as I know all is normal at home except mom is expecting. The clinging started before she was pregnant, though.

I read somewhere on here that this can happen at this age so maybe some of it is just a normal developmental stage?

This dcb has been with me for over 2 years and always loved it here. Mom doesn't seem at all concerned that it's anything to do with me or the other kids, so that helps a lot!!