Hi sweetdreams,
The Dreameasy website doesn’t have the layering of the Ecopur 4400 but you can see it in post #3 here which indicates a layer of polyfoam (probably in the quilting) along with the wool above the 2" of latex. I would want to know how thick this was.
Their site doesn’t list any of their specific mattresses so I would need to know the specific layering of this mattress (with foam densities) to make any comments or meaningful comparisons. Most smaller local manufacturers are happy to provide it for you.
As you can see from the second guideline here … I personally wouldn’t buy any mattress unless I knew the details of every layer (including form density) because that’s the only way to know its quality or value or identify any potential weak links in the mattress.
You can read more about ecofoams or plant base foams in post #2 here. Basically they are just polyfoam with a small part of one of the two main chemicals replaced with some highly modified plant oils. I would treat them as being equivalent to polyfoam.
Post #2 here has links to all the better forum posts and threads about mattresses for children. Children need firmer mattresses than most adults and what is usually best for them would not be particularly comfortable for most adults. I would not choose a “plush” or pillowtop mattress for a child that was still growing. About 1 - 2" of soft foam is the most I would consider and I would go with a medium or firmer comfort layer with only a little bit of sinking in.
Phoenix