Please help me feather sex my newborn chicks :)

[paloozaparty]

Finally hatched successfully, 9 eggs--approx. 3 each from our 3 hens (Gold Sex Link, Black Sex Link, Light-Colored Brahma--from our gorgeous Americuana/EE rooster. We're very new to being chicken pets (since June 2019) and are dying to know what sex these are. I've had no problem guessing others on here--but now that I'm trying to sex mine--ahhhhhhh I can't with certainty so I thought I'd ask y'all for your best guess/eggspert opinions

 

[DutchChickMom]

Not an expert, but my (as far as I am) educated guess would be that 5 & 7 are roo, and doubts about no. 4. But that's just on the development speed of the feathers.
So wait a bit for others to reply

 

[Gray Farms]

Feather/wing sexing won't work. It only works with very specific hybrids. 99% of chicks can not be feather sexed, sorry. Post updated pics at 6-7 weeks of age.

 

[LizzzyJo]

Feather/wing sexing won't work. It only works with very specific hybrids. 99% of chicks can not be feather sexed, sorry. Post updated pics at 6-7 weeks of age.

Which hybrids? Just curious.