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Sometimes I can tell by combs super early (by two to 3 weeks), but it's more of a comparative thing. Then by stance/body type. Then by how/when the tail is forming (females get tails in some of their youth frathetings, while males have silly tails until after their last youth molt) ... Feather color can sometimes be an indication, in my line the females trend toward cleaner coloring (less random black barring on their backs).
I would have to agree here even though I have birds from several lines. Early on behavior and stance can be an indicator but because of the inquisitive nature of the Dels females can often exhibit early male behaviors. I have had the same experience about the feathering so far on the 33 chicks Im raising this year. comb and wattles are harder to judge because sometimes the females can pop up early too.The coloring of juvenile feathers and adult feathers aren't necessarily the same in Delawares. In general, the juvenile males in my line will have more black or gray barring scattered around their bodies than the females, but not always ... and in my line males feather more slowly than the females. This expresses differently with the feathers in each part of the body, so to detail that would take a lot of words.
Females in my line do get proper-looking tail feathers first ... at about 10-12 weeks or so the bird starts to look like a small adult ... but they will still have juvenile feathers which the pullet will molt and regrow, and the way those feathers look may change quite a bit with each regrowth, both in color and structure.
But typically if I see early tail feathers (instead of just fluffy curly silly baby feathers) I presume female ... especially if the tail feathers are a more solid black.
I believe chicks molt and regrow their feathers like 7 times before they get their first full set of adult feathers. The last juvenile molt starts at about 17 weeks, and can take several weeks to resolve. In my line, the males don't really get serious tails until after that ... and tail angle can change drastically several weeks or months later as the bird fills out and becomes hormonal. Females look pretty "finished" earlier. But by that time you'll know sex anyway ...
And each line can be very different!