What are the laws about the type of bed children should be sleeping in regularly?

First its not a good idea to piggyback your question on another thread. This can lead to confusion. So I've moved your question to its own thread.

I've never heard of any laws governing what type of bed a child should use. What makes you think there are some? And what prompted the question?

what are the laws about the type of bed children should be sleeping in regularly?

If you are in the U.S. the Consumer Product Safety Commission does regulate the design, construction and marketing of such things as beds, and especially those made for children.