What better focal point for that first birthday party than a large image of your child? For a very affordable cost, Colorblindproductions will print you a fotomural like this one.
The price ranges by size/number of tiles, and you can choose anywhere from 10 to 50 tiles/pieces of paper on their Etsy site. And of course, you can reuse it in your home as a decoration afterwards.
If you want to do something similar and print it out yourself- you can use the program here for free.