How about getting him a seashell collecting kit that contains different types of seashells, tools like a scoop, a container for storing and organizing the shells, and a book on seashells to teach him about them? You could also organize a visit to the beach together where you can collect seashells and spend quality time with each other.
Or you can get him a star map with the date when he was born.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.