
Maria F. answered 03/30/19
Experienced bilingual international business manager and translator
I would use the term "baby talk", as this is a very clear expression and generically used phrase for such kind of speech (even if strictly speaking it is not a baby, but a toddler). If you are thinking this phrase also applies to adults who speak to babies or children imitating their funny form of speech, you would be correct.
Hope this helps!
Maria VF