If your species regularly has multiple children during its one fertile cycle, then "children" would be more appropriate. And the Ocampa females, by and large, would need to be having multiple children. For the species to be viable.
But that wasn't the rub, the rub was how the writers describe the Ocampa and their procreation, which was claimed to be "short sighted". It continues to be short-sighted. You can come up with explanations to fill the void, we all do it where Star Trek is concerned, but that doesn't change the fact that the writers didn't think their writings on the Ocampa through.
There's no question that the idea of being able to conceive children during one brief period of a female's life, is an odd outlier, even strange. But some such concepts could be called innovative, given the implications that it might carry for how a culture with that reproductive reality, might choose to view the role of females in the society, the vitality and stability of marriage, how the culture views and organizes its utilization of time, etc. Now while certainly interesting, I'm not claiming that the concept or execution of this idea by Voyager's "creative" team, envisioned any such considerations, just an idea that probably seemed appropriate in a sense, for a species that lived for such a short time.
However, to meet the criteria necessary to call everyone involved in the idea and it's scant significance to the series, short sighted, one would really need to be able to categorically cite something that actually and unequivocally states, and enters as canon, that the result of this physiological feature of the Ocampans is only one child per female. Such evidence is simply not present. Kes may refer to
a child, the sense of which you don't care to accept, but she never says that she or Ocamapans generally, are limited to that number. It just isn't there. So, call it undeveloped if you like, or wasted, but short sighted as equaling something logically impossible that everyone just let slip past them, no.
For a species that would need to have multiple children per mother to be stable, never once does Kes mention "children" in relation to her situation.
She doesn't represent the entire Ocampan culture and I really don't think that whatever feelings she has about her fecundity is based on a need that she perceives that the fate of the species will be determined by her decision. It's strictly personal, unless you can find some dialogue of hers that indicates that she sees herself as the Ocampans' savior.
That would be rather nonsensical.
Seems that people here weren't the only one's to notice the short-sightedness of the writers...
To explain how the Ocampan population could be maintained despite each female only giving birth once, the
Star Trek novella "
Places of Exile" (in
Infinity's Prism) suggests that twin and triplet births are common among Ocampa. In the acknowledgments, author
Christopher L. Bennett credits Bernd Schneider's
Ex Astris Scientia website for the idea.
http://memory-alpha.wikia.com/wiki/Ocampa
As the only logical means of elaborating on a tenet, that while left lacking what one would consider proper definition, isn't as actually articulated, absolutely contradictory and fallacious, the idea of twin and triple births has occurred to many fans over time, the vast majority of whom, I would suspect have never read
Christopher's fine work or are regular habitues of Ex Astris Scientia. Oh, and the fact that this obvious answer was posited by someone at that fascinating site or then subsequently implemented in a thoughtful work of fiction, still doesn't make this strange stab by the show runners and the writers short sighted, just laxly follwed through on. For Voyager, been there, seen that..