Hi MrsO,
The Healthy Choice mattresses are made by Restopedic and both use Talalay latex which is also used by many other manufacturers. The key to a “safe” mattress is always knowing what is in it and you will find that there are many manfacturers that use the same materials.
If you haven’t read it already … post #2 here and the information it links to may help you unravel some of the conflicting information abut what is “safe” (or how safe is safe enough), green, natural, and organic and the differences between all of these.
Post #2 here has links to most of the forum threads about mattresses and children and some of the materials that would be a good idea to consider (and avoid) and some good sources for children’s mattresses as well.
Finally … post #2 here includes the factory direct manufacturers in South Connecticut (including Restopedic) and a link to others closer to the Northern Connecticut/South MA area. These would all be worth a phone call and a longer conversation to outline what you are looking for more specifically and many of them can build custom mattresses as well.
Hope this helps.
Phoenix