introducing 4day to 11days

[CaryChickens]

I have 3 chicks that will be 11 days old when the new chick comes home, she will be 4 days old. Is there anything special that I need to do to make sure it is a smooth transition with the introductions or are the so close in age it won't matter?

I currently have an Easter Egger, Barred Rock and Australorp (in that pecking order from top to bottom). The newest to arrive on Thursday will be a Salmon Faverolle, which I understand can be sensitive.

Thank you!