My silkies are 4 and a half moths old and they have me confused about gender!

[Nathaniel Walton]

Hi, about 4 and a half months ago I hatched about 26 eggs, 3 of which were silkies. Up until recently, i have assumed that 2 of them (The brown and White one in pictures) were cockerels and 1 of them (The grey/black one) was a hen. However now they have me utterly confused as to what gender the grey one is as the other morning when i let them out it came out , stretched its neck and let out a strangled crow-ish sound. I have read somewhere that on the odd occasion silkie hens can do this, but still want advice. Please leave your opinions on gender once you have seen the pictures below. (Soorry but the pictures have messes up the post)

 

[Lili Smith]

White is a cockral and the others look like hens

 

[Crazy for Chickens!]

The buff, and the white are cockerels. The middle one is a pullet.

 

[Nathaniel Walton]

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[Snow Flamingo]

Curious, how can you tell between male and female? The red/buff?, looks like a roo to me but the white one doesn't. A friend just got some about 3 months old and is hoping none is a roo. She gets all different suggestions on how to tell the difference. Can you help? Thank you

 

[Snow Flamingo]

Nathaniel Walton, All of your chickens are beautiful!!!!

 

[ChattyChickens4Life]

Buff and white are cockerels. I think the other one is a pullet. Best wishes!