The most interesting and perhaps the most important characteristic of caretaker speech for us is that it is not a deliberate attempt to teach language. Rather, as Clark and Clark (1977) point out, caretaker speech is modified in order to aid comprehension.
Such characteristics and others appear to be more or less common to different types of simple codes, such as caretaker speech, foreigner-talk, and teacher-talk
— 1982 📖 Principles and Practice in Second Language Acquisition