Chickie #3 is
http://privetthatchery.com/Home/prdDetails.aspx?id=MARS a maran... matches the baby. or
http://privetthatchery.com/Home/prdDetails.aspx?id=BKLS, the yellow spot area on the wing sorta.
Chickie #4 looks like Americana.
http://privetthatchery.com/Home/prdDetails.aspx?id=ARS
Chickie #5 is sorta more like the number three. if they are same age though, it has to be two different breeds.
It's also hard to tell when they are not adults yet.
Cute chirpies by the way. I had chicken babies just like 4 and 1. I wish I could have one like the 2nd one, looks so cute.. the red head should mean it is going to be a red bird, but depending on its age... and how it grows its feathers later on, you never know. The RIR babies are yellow at first. I checked that privetthatchery for all the Red Chicken possibilities, but it looks like that baby chick will not grow to be one of those.
My number 4 and 1 were not Americana's. The male, four, turned into my Rooster I have in my pictures of rooster, in Avatar I think.... It's on there... and the girl turned, number one chickie of urs turned out to be Brownie Mix, I think. which is an EE. the two look totally different.