Board Thread:Speculation House/@comment-93.172.97.165-20161023190354/@comment-4010415-20161028142836

Like SYUTK said, they'd more likely cast a female voice actress who can sound convincingly male. Plus, they'd be hoping we'd write off any feminine-sounding note in the kid's voice with "He's really young."

Lil Bro Schnee may not be as innocent as Farmkid. After all, Weiss saw some shit while living with dad ("family friends disappear. Board members, executed.").

Ruby was given rounder, cuter eyes than the other female characters, not just because she's two years younger, but also because she has a more pure, innocent sort of personality.

Farmkid may also be younger than Lil Bro Schnee.

Either way, I feel like RT's design on Farmkid is meant to convey a sense of "This kid is young and innocent" so they gave him big cute innocent-looking anime eyes.