Im thinking the top 3 are roos and the bottom is a baby girl. All are silkies

[Bryce Thomas]

OP can you get a pic of their stretched open wing feathers?

I can but they are all the same. I tried the trick of male vs female wing feathers but they don't have a pattern, all are the same length its not low then high like females. I heard that trick doesn't work with silkies unfortunately

 

[The Moonshiner]

Have you tried turning them upside down and seeing if they kick their legs or pull them up tight?

 

[Painted Calls]

Have you tried turning them upside down and seeing if they kick their legs or pull them up tight?

Stop it.

 

[The Moonshiner]

Stop it.

 

[LadiesAndJane]

View attachment 2612245

All kidding/joking aside. Silkies are notoriously difficult to sex. You really do have to wait until around 4 months of age. If you are looking at crest size at this age, it is likely do to some of them having a vaulted skull, which makes their crests look bigger. It is not an indication of gender, though some breeding lines have more females that are vaulted.
If you must know what gender they are before then, you can send feathers in for DNA testing, though it costs around $12 per bird to do it, may not be worth it.
You have to wait until they are at least 4 weeks of age to send feathers in though.
Good luck with your babies, they are cute!
Oh you can't wing sex silkies....