You Have an Announcement to Make
If you harken for a more thoughtful intro, but don't necessarily want to spend the time and money on a traditional mailing, consider the e-announcements from Cocodot. They have a wide range of beautiful designs, many including a spot to upload a photo of your little darling, or you can get creative and design your own.
Available for $29 for unlimited cards (for one year) at cocodot.com.
Start by teaching him that it is safe to do so.