ladybrasa
Songster
So far the buff Brahma appears to have round tipped saddle feathers, which indicates female, but everything I’ve read is 3 months is about the time to tell for sure. 
For the light Brahma I can’t really see the feathering - saddle feathers are those in the area you would put a saddle on a chicken to the base of the tail. Not the tail feathers.
There are some good pics on BYC indicating make and female saddle feathers, but unfortunately I don’t have them bookmarked
In the pic of mine with the Brahma that turned out to be a girl you can see that the feathers on her back are round-tipped, not pointy like a boy. (The pic from the make isn’t that great and hard to make out the feathers, imo)

For the light Brahma I can’t really see the feathering - saddle feathers are those in the area you would put a saddle on a chicken to the base of the tail. Not the tail feathers.
There are some good pics on BYC indicating make and female saddle feathers, but unfortunately I don’t have them bookmarked

In the pic of mine with the Brahma that turned out to be a girl you can see that the feathers on her back are round-tipped, not pointy like a boy. (The pic from the make isn’t that great and hard to make out the feathers, imo)