Generally speaking, if you grind your ears, it is suitable for children under 3 years old. At this time, it is more effective to cultivate children's hobbies with sound. Of course, children over 3 years old can also be educated by playing music and English programs. There are many free resources in Niuting app. Even if you don't buy his morning education machine, you can listen to it on your mobile phone. I recommend 40 children's songs of language sense enlightenment system and nursery rhymes of Mother Goose series.