This one came from the same flock and we thought it was a boy based on the comb size and redness, this picture at 8 weeks. But he ended up being a she. (Just for comparison).
A way to tell, even though it isn’t always reliable, is to look at the shape of the hackle feathers. Males hackle feathers will be long and pointy, while a female's will be round. Looks to me a male like previous people said