Help me sex my chickens

[14Chiggen88]

New here. Joined because I been reading this site to learn about my new chicks.
My chicks will be 3 weeks today. I still have no idea their gender but luckily I took some pictures and videos of them as soon as I got them home. I read that you can usually tell your chickens sex after they are born/few days old.
These are barred rock chickens btw. I am a beginner also. Everything I read online just further confused me as to their gender. I'm still trying to figure it out at 3 weeks. But here they are when they were brand new
I appreciate anything you can tell me

 

[DemeterAD9]

Unless you have a sex linked breed it is very hard to be 100% sure of a chick's gender until they are around 8 weeks old. With barred rocks I think chicks with a big white dot on their head are male, small/narrow white dotted heads should be female. This isn't 100% though.

Check this out and see the link in the thread.
https://www.backyardchickens.com/threads/sight-sexing-barred-plymouth-rock-chicks-at-hatch.798635/