Aw, he's sure cute. Definitely a "he"... again
. I can't see any hint of blue yet, he's still young. But if it is the brown spot you're referring to, that is a little food or some sort of debris that will come off.
A young female would not have such a pinkish lavender cere. It would be chalky whitish light blue, then as they approach maturity, it gets more white, then if they should come into condition, it gets tan, then brown. But you most definitely have a boy