1. Age: Babies of different ages need different types of books. For example, babies of 0-3 months are suitable for reading black and white patterns, large fonts and simple picture books; Babies of 3-6 months can start to contact some audio books and simple picture books; Babies over 6 months old can try to read more picture books and story books.

2. Safety: When choosing books, pay attention to whether the materials are safe and non-toxic, and whether there are sharp edges or small parts that may cause harm to the baby.

3. Content: Choose content suitable for your baby's age and interests, and don't show your baby books that are too violent, scary or adult.

4. Easy-to-understand language: Babies have limited reading ability, so books with easy-to-understand language are more likely to attract their attention.

5. Interactivity: Choose some books with interactive elements, such as touch sensing and sound effects, which can enhance your baby's reading experience.