Not untill they grow up.
Other methods have to be learned and if done wrong like vent sexing you can harm the chick.
Feather sexing is done when a slow feathering female is bread to a fast fethaering male.
I have two 11 week old Aussies and I was not able to tell until they grew in their rounded hackle feathers and neither has saddle feathers either. Around week 7 it should be obvious.....good luck
My black australorp was so hard to figure out. Many people on her kept telling me they thought she was a roo, but I kind of doubted and just kept posting pics. They also thought she wasn't a BA because her earlobes weren't red so I went through a period of time when I was researching minorcas, jersey giants, etc. trying to see what I had. At about 16 weeks her earlobes turned red and it was about that time I figured she was a "she". 21 weeks - no eggs yet - but I know she's a girl.
A lot of people though she was a roo because she had long legs, red comb was more developed than some of my other breeds at that age...
I have 5 BA chicks that are 3-4 weeks old. All the females are developing feathers at the same rate and have a decent tail and very small comb. One has an itty bitty tail and a much more pronounced comb and is already doing the whole posturing thing.... pretty darn sure that one is a roo.