Hi jmc612,
All foam materials (polyfoam, memory foam, latex foam) will soften to some degree initially over the first 30 - 90 days or so but with latex it will be less than other types of foam and any further softening that happens over a longer period of time will also be less and happen more slowly than other foam types (which is why latex in general is the most durable foam material). The cover and quilting will also “break in” as well as the materials or fabrics stretch and lose some of their initial “false firmness” and stiffness. There is also more in post #2 here about the break in and adjustment period for a new mattress and some other suggestions that may be helpful as well but in most cases it’s best to “do nothing” for the first 30 days or so and then assess whether you need to make any changes or adjustments after that.
Phoenix