vepre experimental gismu

x1 is a non-binary child/kid/juvenile [a young person] of age x2 immature by standard x3.

See discussion associated with "dinti" concerning whether this meaning is restricted to "affirmatively nonbinary" or whether it is more general. Word dispreferred in metaphor/example as sexist or exclusionary (use instead "verba"). See also: "nixli", "nanla", "verba", "bersa", "tixnu", "nunmu".

In notes:

x1 is an agender humanoid person [not necessarily adult].
x1 is a non-binary humanoid person [not necessarily adult].
x1 is a non-binary offspring/child of parent(s) x2 [not necessarily biological]; x1 is filial (but not a son or daughter).
x1 is a non-binary-gendered humanoid person [not necessarily adult]