play games
You can play some family games with your baby, such as giving two identical patterns, but there are subtle differences between the patterns, so that your baby can distinguish them in a short time.
read
Tell the baby books, or buy some books, give them literacy, and cultivate their interest in learning.
teach by precept and example
Analyze and explain some novel and interesting things in life, ask questions to your baby, attract your baby, and exercise your baby's ability of observation, thinking and analysis.
Do your own thing.
Tell your baby to clean up the toys he has played, and parents who can do it will resolutely stay out of it, exercise their hands-on ability, and don't rely on their parents for everything.
Teach your baby good qualities.
Teach your baby the beauty of this world and refuse the ugliness. Teach them to be helpful and modest, and at the same time teach them not to trust strangers and to know how to protect themselves.