We live in a quiet estate with many children. My DS1 is 5, in reception, and 2 of his classmates regularly play outside on the street, on bikes, footballing etc. DS1 is upset because they knock for him and I won't let him out unless I am free to go with him (not often, I have 2 smaller dcs). I don't think he is mature enough to be responsible for his own safety in terms of avoiding cars, staying where he is told and not going onto the main road, talking to strangers etc. The other mums seem to think I am over-protective. I have tried to compromise by inviting the others to play in our garden, but now I have a house full of other people's kids making a mess and raiding our fruit bowl, and no reciprocal invitiations because they just let theirs roam the streets! What do you think?