Is something wrong or is this normal?

[Chickncrazymama]

This is my 6 week old black australorp. Everyone else feathered in pretty well except this one. Is this normal but slow feathering or is something wrong?

 

[Mountain Peeps]

Slow feathering can indicate a rooster. But, I've never owned this breed before so I can't help much with what to expect in terms of growing.