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Laura, I took this picture that you had posted earlier with me to the pen and to my new inexperienced eye still could not tell. I guess I will have to wait until they mature a little more.
Both birds that you can see the comb on look to be Cockerels. However, also going by the shanks the one that is facing right does have thicker shanks as the one facing away. Most times you can compare the combs, shanks and feathering like Laura posted however using the feathering you can tell or at least it looks like to me that it could be misleading on these two birds as the one on the left does not have the strainger feather like in the photos Laura posted vs. the the bird on the right that does seem to have straighter feathering showing. So using all three methods is a better way of determining sex in 2 to 4 month old birds. However, disclaimer it would also depend on how fast your birds are developing based on line/strain as well to see what is what. At least that is my experience. Some birds from some strains/lines could develop faster than others which could help or not help it all depends on the strain/line i guess.
I would agree with Chris tha the bird closest to the corner (middle) of the photo appears to be a pullet.