Of the Silkies, I think I'm seeing 1 pullet and 1 roo, but hard to tell in those photos, and Silkies are hard to tell any way.
*Usually* the girls are low to the ground, squattier, and more tear drop shaped. Boys are taller, lankier. Girls have pom poms while boys get the mowhawks. Any comb/wattle development younger will be male as girls have very little even as adults.