Could these 9 week old Serama's be cockerels or pullets?

[Zinjifrah]

This little fella was barely 2 weeks old! View attachment 1483232

So far, my earliest confirmation was six days... Blueroo was a precocious little thing! That's when he started trying to crow. It sounded like a weird trill, full crowing behavior, tiny puff-ball wings flapping and neck arched.

 

[Crazy for Chickens!]

Pullet

 

[Carla1200]

Thank you all for your messages. Very informative. Great to learn from your experiences . Thanks.

 

[Carla1200]

Some better pics. Separate and all 4 of them together. Are there still knowledge members that guess I might be that lucky that all 4 of my first hatched serama's are pullets?