I'm not sure I have any advice but wanted to share that we have been going through a similar situation with Kiran, who is now 27 months. He was such a friendly infant but somewhere between 12-18 months he became very bashful toward adults. He migrates to children and has no problems socializing with them but is so shy around adults that if they persist in trying to talk directly to him he will scream. It has gotten worse as he has gotten older.
Sometimes I stay at preschool with him to help the teachers who have their hands full with a room full of 2 year olds. Of 12, only 1 seems well adjusted socially with adults *and* children. Some are fine with adults while playing or doing activities at what I imagine is a safe distance (to them) from the other children. I"m not sure if you can gather anything from that observation,.....perhaps it indicates that your babe is going through a normal phase? I admit,...I don't know. *hehe*
