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I'd think it's normal, but his 1 day younger sibling already has his head feathers coming in at once

Hello! I'm raising 2 babies right now, and the older one seems to only be sprouting a few feathers on his head while his/her sibling almost has a full head. Is this normal? Could it be a sign of something going wrong? They're growing well, and are very energetic, this is pretty much the only...