Letting chicks with mum out of run

I have one with 5 week old chicks out and about and another with chicks that were hatched in the hedgerow just a couple of days ago out and about - I never have a problem letting mine out 

We've never separated our natural hatched chicks from the main flock - the mother hen does a very good job of keeping the others at bay and then by the time she decides she is bored with them they are part of the flock and accepted - if at the bottom of the pecking order.

Incubator raised chicks are different - I move them to where they can be seen at 4-6 weeks depending on the weather and then they get to run with the big flock at about 10-12 weeks. At this time they appear to be tolerated as long a they mind their Ps and Qs and integrate fully over time.

For the first couple of weeks I do feed the 'teenagers' in the closed run otherwise they would get bullied off.