Even if allowed by Retuner, I'm not sure that children will really accumulate the skill behind the scenes that they would then later get credited for when they age up as they do with the mods. TwoFtMama has (or at least had) some mods like this on The Asylum but as she does not create animations the awful looking stretching thing was always inevitable.
I have to vote for the Children Can series on MTS. I've been using those ever since they came out and they have been fine. You will see that 95% of the "complaints" on that mod's message board are really thanks posts and begging the developer to return and make more of them for other actions like horseback riding that were not included.
