It can be frustrating for us and for our children that we know so little about their life before we met them. When I started on Zoe's lifebook, I tried to collect as much information as I could, including the weather, the phase of the moon, etc., for the day of her birth.
This birthday calculator gives a lot of fun information, including possible date of conception, how many days/hours/minutes you've been alive, Zodiac/Chinese Zodiac information, and more. I think I'll print out each girl's report for their China Workbooks. It isn't a substitute for REAL information, but it's better than nothing!
Thanks to my mom, who sent me the link!