We recently added 3 chicks to our small suburban flock, giving us a total of 5. (had more but they died ). When I first introduced the 3 new to the older 2, there was an immediate issue with "pecking order" which I expected. We kept them separate for a few weeks and then allowed them to congregate. No real issues except for a dominant hen that kept pecking at the new arrivals. Figured it was normal and it turned out to be exactly that, normal. Here is the interesting part. We have an elevated coop with a ramp to gain access. As everyone knows, when it gets dark they retreat to the coop and roost. The older birds would do that, but the younger birds would not be allowed inside and would sleep, wedged in the doorway to the coop. Now its a few weeks later and one of the new chicks dropped her first egg. I noticed that night, she was roosting with the older chicks, while the other 2 newbies stayed in the doorway. Fast forward a week later and another new egg arrives and now that chick is allowed to roost with them also, leaving one chick in the doorway. Eventually she also started to give eggs and was allowed to roost at night. Not sure why, but it seems that once they start to lay, they are accepted into the flock. Is it pheromones? My only other concern is that the new chicks are full size (cuckoo marans, buff orpingtons) but started laying pullet size eggs. I don't remember our older Easter eggers doing that. They gave full size eggs from the beginning. Will the egg sizes increase with time??