Hi Jnelson
Welcome back to our Mattress Forum! 
I am glad to hear that after 4 years you are happy with your mattress. :lol:
I agree that you would need to know the information listed in this article about any mattress you are considering (regardless of the manufacturer) so that you can make sure there are no lower quality materials or weak links (or any materials that don’t meet your specific criteria ). If you cannot confirm the detailed information about the quality/quantity of foams used in the Spinal Care mattresses I’d assume that the materials have changed and move on to something where you can find out the specifics of each layer in the mattress rather than using only some “general” information.
As far as recommendations for mattresses for children, Post #2 here includes links to most of the better forum posts and topics about mattresses and children and includes some suggestions and guidelines and to some good quality/value options as well.
Listed in alphabetical order here are some of our Trusted Members who carry safe and healthy mattresses for growing children or mattresses are very well suited for children: I also listed slightly higher budget mattresses as by using the TMU coupon these may be options you’d wish to consider.
[indent]Arizona Premium Mattress’s Latex Bed for Kids with a great price point.
Flexus Comfort also has a great dual-comfort mattress suitable for children using 100% natural Dunlop latex core
Latex Mattress Factory Naturale Mattress is an option suitable for children.
Luma Sleep’s Base Luma Mattress in its firmer version
My Green Mattress with the Natural Escape (a bit higher budget range but you can use the 125 Off Mattress (Code: TMU125) offered to TMU members)
Pure Echo ( One version has no foam at all and is just an innerspring with a natural fiber cotton/wool comfort layer and the other includes latex.)
Quality Sleep Shop specializes in innerspring mattresses for children
Sleep EZ Roma Latex Mattress with dual side configuration (Medium-Plush and Firm Feels)
Sleep On Latex Pure Green Mattress good price point mattress suitable for children.
Although for a higher budgets Cozy Pure’s two-sided Natural Latex Mattress using Certified Organic Cotton and wool on top of 6" natural Latex core, maybe worth considering[/indent]
As with your daughter before … I’d make sure to choose a firmer feel for your son as well. Children spend more time on a mattress and have a much more flexible spine that is less curvy than an adult, and they need to be better supported than an adult by the surface layers.
Phoenix