P.D.
My husband and I started this when I daughter turned one and she is now three. We each write her a letter on her birthday every year and then print and save it. The letter includes some of the things that we did as a family that year, small things each of us particularly remembers about that year, cute things she was saying, etc. It is really neat because at the end when we read each others, we both had different perspectives on the year. We plan to either give her the letters when she leaves for college or when she gets married, not sure yet, but for now it is something we both enjoy doing and plan to also do for our second daughter!