The Sims (1) Mirror's won't work for child?

In The Sims 1, you can't change your Sims' appearance using a mirror. That's not how it works. To change a Sim's appearance, whether they're an adult or a child, you need to click on their wardrobe.

It's important to note that changing your Sims' appearance in The Sims 1 is limited to changing the clothes they wear. You can't change their faces or anything like that (unless you use external programs to do so).

Really? then why does it say I can use a mirror in My Actual book & on wiki that I can? & I was able to do so in My (Original) Sims 1 game which I still have the actual (original) for still. 

The Legacy game isn't letting me, but I know I was able to before cause there were certain look's I wanted for the children in My game, I just did not rely on them looking the way they did from Baby to Child. (Not), & no I never used Mod's or CC for it either.

I don't recall being able to  change the children's appearance?  Maybe someone who still has the original installed can help with this. I don't think I have the patience to reinstall mine again. 🙂 Perhaps with a mod?   I'll be following this as well because I would love to know.