Hi Country Girl,
My guess would be that Sweet Pea is a boy

, but I can't be positive. We have three boys and one girl, which we have bred and have many babies which we were *usually* accurate on our sexing, but then again they were babies.

Two of our boys ceres have turned blue and the other one is indefinite, although we know he is a boy. Judging by the lack of bars on his head, he is older which means the cere probably isn't going to change anymore, and since it didn't turn brown, its probably not a female. As for the white circles around his nostrils, (like QPdad mentioned) I believe that only means they are female when they are babies, before maturity is reached. I think that some males just don't change to the blue cere, like our Charlie, it could have something to do with the pigmentation. (our Charlie is white with a very pale blue)
Good Luck!