Hello!
We have been discussing about adding contents for children in Basque wikipedia, and the solution found needs an extra namespace called "Txikipedia", so we can create an extra tab using some system discussed here: T189459.
There's community consensus about this, as voted here: https://eu.wikipedia.org/wiki/Wikipedia:Txokoa#Vikidia_eta_Wikipedia, and also about the name, as can be seen in the link.
This extra namespace will have specific content.
Thanks!