S.H.
Normal.
Don't force it.
It is all developmental based.
NORMAL.
Don't worry.
It is not about being 'brave' or not and don't tell him that. He is normal... and this happens to all kids. Don't make him feel self-conscious or compare him to other kids.
Put it this way... if he did NOT ever go through 'stranger anxiety' or fears... then THIS would be a concern, developmentally, and he would then, 'not' be developing normally.
A young child, does developmentally go through stranger-anxiety/fears, because of proper development... and changing cognition/emotions etc. So the normal child, WILL go through that. It is expected.
On the other hand, for the child that never does react this way.... then, this would be 'off' developmentally and signal a red-flag.... a friend of mine, a child development professional... said that my son, when he was going through that.. it is GOOD and she said it is an important stage for children to go through. But... for children that never go through that, then she, as a Professional, says that this signals other developmental problems....
all the best,
Susan