I’ve got quite a bit of Lillka’s stuff for toddlers and children. https://www.thesimsresource.com/artists/lillka/
I also have a few of the Sifix formalwear dresses.
Those are the ones I can think of off the top of my head, I’ve got many others!
When it comes to CC, usually I’ll google something like “sims 4 toddler dress” or “sims 4 curly hair” and check the Google Images results. I stick with MM hair. I mostly have hair and clothing, with one pair of CC glasses (which are just a recolour of some basegame glasses) and some CC freckles. I don’t have any custom makeup or skins or anything. Oh yeah and I have some custom BB stuff although not much.