Ming @ Agents of Speech breaks down how children communicate in therapy. When a child hand-pulls you, they're making a request. That's pragmatics: the function of what they're saying, separate from the words themselves.
Let's say that your child is learning to say I want cookie in a therapeutic session. So we can split that into a few aspects in language. So first of all is the form, like they're using a sentence form of I want something like fill in the blank. That's the form. The content is like the meaning of the word, which is like I want cookie, meaning the child wants that thing. There is also what we call a language use, which is generally said to be the same as what we call pragmatics. And what that means is what's the function of the language? So there are different functions in the language. So, so we're trying to build up the different functions and language, such as requesting, which is a huge one. Like if your child wants something, they're hand pulling you. Then their language use, the pragmatic of the hand pulling is actually requesting.
