When can I let my mamma hen and 4 week old chicks merge into my current flock?

[MiaTheChickenWhisperer]

My flock is extremely exclusive to newcomers. It can be dangerous to leave young chicks in the coop if your flock is this way. Usually, I put the newbies into a small kennel and put the kennel into my coop. This allows the other chickens to get used to them without the possibility of attacks. I forgot to do this with one of my young hens and my flock injured her pretty badly.

 

[BDutch]

My flock is extremely exclusive to newcomers. It can be dangerous to leave young chicks in the coop if your flock is this way. Usually, I put the newbies into a small kennel and put the kennel into my coop. This allows the other chickens to get used to them without the possibility of attacks. I forgot to do this with one of my young hens and my flock injured her pretty badly.

Did you have chicks with a broody like Newchickenmom?
This might be a different situation bc Newchickenmom has a caring and probably a protecting mother with her chicks.