4 week old Australorp - male or female?

[Chunkychonkers]

Hello everyone! First time posting, long time scroller. We have a very sweet 4 week old Australorp (possible mix). Wondering if anyone with more experience can guess whether Wilma is actually a Willy? She has developed very big legs and wing and tail feathers very quickly, and now has a pink comb and the start of pink wattles. She's very sweet and we will love her either way, but just wondering what she might be! Here's some pics.

 

[wrathsfarm]

Willy...