[grimgrin]

I did not know what class inclusion was, but now I'm thinking it's more complex than that? After a little bit of reading. "all daisies are flowers" and not "all flowers are daisies", this example seems more like the "solid grasp" you're referring to. And not basic categorization that a 3 year old might have: "foods", "toys"

[br3d]

Hmm, I'm now struggling to remember basic developmental psych, but there's definitely a phase at which linguistic children struggle with things having two names (it can't be both "dog" and "Rex") but I think you're right - this phenomenon is subtly different to class inclusion. But either way, dogs can do something with language comprehension that speaking children can't, which is the bit I find really interesting

[AeroNotix]

I need to read up more on this because in my extremely small sample size this kind of dual naming understanding came in really early with my daughter.

I feel like it's a linguistic subtlety that us adults are struggling with conveying the exact concept.

[djtango]

My niece and nephew are being raised semi bilingually and they were happy to accept things could have multiple names before age 2 IIRC. The youngest only just turned 2.5 and can happily flick between Chinese and English (though has a bias towards English because that's what she hears more by a big margin)

Will be interesting how my future kids will be as they will be pretty much exactly 50:50.

[AeroNotix]

My daughter is bilingual too. I wonder if that has something to do with it.