Children as young as toddlers can begin to enjoy sandbox play. The best sandboxes for the littlest members of your family are those that are shallow and easy to clean and maintain. Check the manufacturer's recommended age range for any sandbox you’re considering. Fill the sandbox with play sand, natural river sand, or beach sand, and make sure the product does not contain any silica. It’s also important to keep the sandbox covered to prevent bacteria and contamination from animals entering the sandbox.