First thought, I do not believe worgen bear human children. Sadly all my detailed posts explaining why are lost from the old forums… but long story short, “curses” are heritable. See Curse of Flesh, Sethe, Horns of Echo’ro, etc. Regardless, children worgen can happen one way or another (see Lil’ Bad Wolf). So let’s talk about how.
Now… going under the idea that worgen do bear human children, there are still those who would want their children to have what they have. There is no lore of rites of passage, besides perhaps the Bloodfang and Nightbane and their Righteous Kill. This rite (shown in Curse of the Worgen) requires you to kill a human enemy of the pack, after which you earn the bite, and become a worgen. That could easily apply as a rite of passage to such a youth aspiring to become a worgen.
However I do know that people such as the Bloodfang Pack live in a hostile territory populated by Forsaken, and would want to bite their child as ees early as possible. Every year their child is a human, is a year at risk of being captured and turned into a Forsaken, whereas the worgen curse would grant them immunity from undeath (Silverpine questline). Nightbane similarly have populated Duskwood for thirteen years, and I have no doubt that couples would have formed in that time. Like the Bloodfang, the Nightbane are part of the Wolf Cult (shown in Dark Riders) and consider the worgen curse to be a blessing. Likewise in a territory populated by undead, and seeing the curse as a blessing, would likely give the infant the curse as early as possible. Which, considering how small the Lil’ Bad Wolf is, is rather early on.