Ming from Agents of Speech explains quality repetition: say a word while doing the action so the toddler links them together. The repetitions must be successful, meaning the action actually follows the word, and done in quick succession. Just saying words without action doesn't stick.
Chapters
So if the child is holding on to a fork, all you gotta say is holding fork, Right? Or if a child wants the phone from you, you say, I give phone. That's right, give phone, unlock phone, turn up volume, turn up, turn down. Right? All these things. Say what you want to hear and do the action. Because if your child can learn from the iPad, they can earn from you. So what's different here is that you need to provide many successful repetitions. What does that mean? A lot of times parents do provide a lot of repetitions, but it's not successful. A lot of times after you say something, nothing happens. So therefore the word doesn't get linked to the action or the concept, so to speak. So that's why it's getting ignored. What I mean by successful action is if you say open and you do open the box, then that's one successful action. And many times parents, after they say that, they don't do it once only you need to do it many times in one instant, keep on repeating.