Bit suspicious about them all, the black one is male it looks like from the width and color of the comb (and the slow-feathering it's showing is also sex-linked in many cases, to males) and the white one has too much pinkness of comb for the average 5-week-old female... And the blue one looks like a pullet combwise but the wattles are unusually evident. I'd keep an eye on the blue but the other two look like boys, sorry.
Best wishes.