The red-headed kids were adults in disguise.
The red-haired children tended bigger than the rest of us, with more adult facial structures, to the point where you could’ve maybe mistaken them for very small adults in disguise. The red-haired adults, what few of them we ever saw, were correspondingly huge and muscular.
~1 minute per generation but you can extend songs indefinitely with further generations. (Which are quite limited, 5/day in the free tier up to thirty-something/day in the most expensive premium tier.)