Yea can just borrow from the library, they have many types or even the touch n feel. At the early stage their attention span is kinda short, so it just more of exposure to them that is all.
Check if you have read the recommended books on this article https://sg.theasianparent.com/best-kids-books/
The Library is a great place to find classics. You can also try Kinokuniya and Woods in the Books
Some nursery rhymes maybe? Dr. Seuss is fun for all ages too.
How about renting from National library?
shoppee has a lot of good ones