Trying to sex my 11 week old Silkies

[Hill Country Chick]

Hi All, so I am new to this forum and new to chickens in general. I bought my first batch of Silkies on 3/15/18. I have figured out that my Buff is definitely a cockerel, even though he was smaller than the other 3 Silkies, he has always been the most outgoing of them all, he grew a mulberry colored walnut shaped comb above his beak and mulberry wattles and he started crowing about a couple of ago! He now has a name, I named him George

But, the other 3 Silkies have me a little perplexed. They are all 3 the same size (larger than George), they are more shy than George, none have shown any signs of growing a comb or wattles, none have crowed, I'm guessing they are pullets. Can anyone tell me if it is safe to go ahead and give them girl names or should I wait a bit longer?

 

[RodNTN]

It is difficult to sex Silkies, so you may have to give it a while longer. Pictures?

 

[silkiecuddles]

Silkies are notoriously hard to sex, unfortunately. If you post pics, we can give you our opinions Personality is usually the most telltale way for me with my silkies, however.

 

[Hill Country Chick]

Sorry it took so long to get photos uploaded! So the pics of Blackie and Whitie are about 3 weeks old now but they still have no new growth as far as comb or wattles, and still no crowing from these two or from Brownie. As you can see George is definitely a boy. All 4 silkies are the same age. George grew his comb & wattle at about 6 weeks and they started turning a reddish color by 7 weeks and then he started crowing at 8 weeks.