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1st chick is 100% girl.
#2 is most likely a girl (it would help to see a full body pic of her). Watch for reddish brown splashes to appear on her wings in the next few weeks - that would signal that it's a boy).
#3 is most likely a boy (based on it's coloring) - I'm pretty sure you will see those reddish brown splashes on his wing bows soon, but could be wrong. Ignore the number of rows in the comb - it the comb on #3 stays small and light and looks like the comb on #1, then it's a girl, but if that comb turns bright and gets noticably larger than the comb on #1 in the next few weeks, it's a boy.