Is it ok to buy preloved kids books? How do u clean paper books? what is the other child had hand foot mouth disease or some othr contagious illness?

Personally, I wouldn't buy preloved books for my child until he or she is old enough to know that putting things into his or her mouth is not necessarily a good idea. But then again, buying pre loved books is very similar to borrowing books from the library. You never know who or what has come into contact with those books. At the end of the day, I reckon it's up to you. If you feel squeamish about such things, best to avoid buying pre loved books, if you don't think too much about it, then you're free to explore many preloved shopping options.