* Baby talk: This is the most common and straightforward term.
* Motherese: This is a more formal term that emphasizes the specific characteristics of baby talk, such as higher pitch, exaggerated intonation, and simplified vocabulary.
* Child-directed speech: This is a more scientific term that encompasses any kind of speech directed towards children, including baby talk.
There are also other, less common terms like parentese, infant-directed speech, or babyese.
Ultimately, the best term to use depends on the context and your audience.