Golden period
0 to 3 years old is the golden age and the best time to develop intelligence.
brick by brick
Parents need to start with the most basic theory of early childhood life, and then slowly listen to some pure music, nursery rhymes, short stories in Mandarin, Analects of Confucius, etc. to develop their children's intelligence. Slowly, you can show your baby some animations to guide your baby to know Chinese characters, digital mathematics and so on. This is a gradual process.
Parents study.
Generally, parents learn within one year old, and babies listen mainly. After one year old, you can slowly show your baby some educational videos and animations.