Hmmmm...
I was going to guess male for the 2nd one with the wattles, until you said 4 months old. The silkie could be maturing and getting ready to lay. Silkies are very tough. I also can't see the back of the crest. Does either have streamers?
Here's a link to show what I mean:
https://www.backyardchickens.com/threads/silkie-baby-sex.825986/#post-12040949
The good news is that you shouldn't have to wait much longer. I would think if you actually have a male (& I can't say that you do), he would start crowing attempts.
I was going to guess male for the 2nd one with the wattles, until you said 4 months old. The silkie could be maturing and getting ready to lay. Silkies are very tough. I also can't see the back of the crest. Does either have streamers?
Here's a link to show what I mean:
https://www.backyardchickens.com/threads/silkie-baby-sex.825986/#post-12040949
The good news is that you shouldn't have to wait much longer. I would think if you actually have a male (& I can't say that you do), he would start crowing attempts.