Hi Ilene,
Just in case you haven’t read it yet … the first place to start is the tutorial post here which has all the basic information, steps, and guidelines that can help you make the best possible choices.
If you let me know your city or zip code I’d be happy to let you know of any of the better options or possibilities I’m aware of that are reasonably close to you.
Jeromes has several mattresses that are called “birthday” so if you can link to the specific two that you are considering I’d be happy to make some comments either about their quality or about any additional information you would you would need about each mattress to make an informed decision.
Outside of the quality/durability of the materials … the best choice would be based on your sons testing each mattress to decide on the one that was the best “match” for each of them in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences).
Phoenix