1. Game-based learning: The 3-year-old baby is in the stage of strong curiosity. Game-based learning can stimulate their interest in learning, such as puzzles, building blocks and toys.

2. Painting: Let the baby doodle freely on paper, which can exercise their hand-eye coordination and imagination.

3. Music: Listening to music can make babies feel the rhythm and melody, and at the same time, it can also cultivate their musical cells.

4. Story time: Telling your baby some simple stories can help your baby understand the story and improve his language ability.

5. Parent-child interaction: Parent-child interaction with the baby, such as cooking together and making handicrafts, can strengthen the parent-child relationship and also enable the baby to learn some practical life skills.