Hi milleraj21,
The 1.5 lb density base layer is a little lower density than I would normally suggest (see the durability guidelines here). I would also tend to avoid memory foam for younger children.
There is a also great deal of information in post #2 here and the topics it links to about mattresses and children and “suitable” and “safe” materials including a link to some general guidelines for children in post #2 here. It also includes a number of links to the better forum posts and topics about mattress and children as well which have more information about many good options for children which would be well worth considering.
I also forgot to link you to the Atlanta list in my previous reply.
Subject to confirming that any retailer or manufacturer on the list is completely transparent (see this article) and to making sure that any mattress you are considering meets your specific criteria and the quality/value guidelines here … the better options or possibilities I’m aware of in and around the Atlanta, GA area are listed in post #2 here.
Phoenix