There is a little bit of pecking with some hens chasing them for a couple steps. Our rooster seems chill with them. The hens usually attack their poor mama Friday but leave the chicks alone unless they are up in their space( being chicks of course they are ) but have been doing good with them for the most part. turn 6 weeks Thursday. Do you think they will be ok?Your header suggests that you are wondering when to introduce your 13 five-week old chicks to your flock? Do I have that right?
And that they have been staying together for a short period of time. With no ill effect?
In my personal experience, unless you have a very docile flock, I prefer to integrate new chicks to an established flock fully when they are just a bit older. The young ones can spend their whole day running from the adults if the adults are more aggressive.
Be sure to have plenty of feeders and waterers (separated apart) for them to be able to eat and drink.
I seem to do best when they are more "teen size" when I am integrating artificial brooded chicks into an established flock...so about 9 to 10 weeks of age.
However to answer your question more fully, if they are doing well without too much hazing, they are fully capable of taking their place in the flock now. I've gone to natural hen brooding for the last 5 years, and my hens bring them into the flock about day 3 or 4, and I have no integration problems because momma is running interference for them. Then by week 4 or 5, momma has fledged them and they are running wild among the flock with an occasional peck from a cracky hen when they get too wild. They pretty much run as a pack within the flock, nesting together at night in the coop. Nobody raises an eyebrow or beak.
So it is possible now....but only if your flock is pretty chill and won't over haze them.