Discolored Feathers and Molting

[plymouthrocksrock]

Hi all,
For some time I have noticed that my Australorp hen has some discolored feathers on her bottom. Normally, her feathers would be black, but some are brown and some are bluish. I am wondering if this is a problem or not. Secondly, my Barred Rock hen is molting at nine months, and she seems to be moulting around her vent. I am wondering if this is normal.
P.S. The rocks vent moulting has come after her head and neck.
Thanks

 

[Illia]

Both normal. The brown you see is old fluff that has been "sunbleached" - the black and blue is new fluff.

The molting girl is also fine.

In fact is sounds like they're both molting.