Brand new to the site and this is my first post so please forgive me the ignorance! I've had chickens before but never any youngins. Recently I purchased some egg laying age BB Red Bantam hens, but the lady also gave me 4 Silkie chicks as a gift. She said she believed they're about 4ish weeks old. I was curious to know if anyone could possibly point me in the right direction of determining if they're female or male? I'm usually pretty good about this but these silkies are throwing me for a loop. I added some pictures below and numbered them so that they'd be easier to tell apart. One happens to be a silkie/polish cross. Not sure if that changes things with the sex determinations. I can also add more pictures if need be.
Just would like to know what I have so I can name them! I'm so excited!
2. Silkie/Polish Mix
3. Smaller Silkie
4. Larger Darker Silkie