Hi Jnelson,
Post #2 here and the posts it links to have more information and guidelines about choosing a mattress for a child that should be helpful.
Children tend to need firmer mattresses than adults and In many cases a mattress that would be “comfortable” for an adult that prefers thicker or softer comfort layers wouldn’t be the best choice for a child.
I think highly of Spinal Care bedding because they are much more open and transparent about the type and quality of the materials in their mattresses than most other wholesale manufacturers in the industry and they tend to use higher quality materials in their mattresses than most of their mainstream competitors. I wish all manufacturers were as transparent as they are. Having said that … this is the type of information that a knowledgeable and experienced retailer should be able to provide you rather than needing to find out directly from a wholesale manufacturer.
While there are no obvious weak links in the mattress in terms of the quality and durability of the materials (see the guidelines here) … I would avoid buying a plush mattress for a child.
Phoenix