Back in my day, lenticular printing showed up as small prizes in my Cracker Jack boxes. Remember these small cards where the images moved as you looked at the card from different angles. Now this technology comes to custom printing via the Internet by Snapily.com. You can make custom "animations" by uploading different images of your baby, and voila, you can send out unique baby announcements that "flip" between images.
Check out Snapily.com to customize your own customized 3D printing.