I'm going to write my life hacks here as I can think of them. I'll start with this one:

• Kidmail. Setup a gmail account for your new infant child, and give out the address to only your closest friends and family members, then asking them to email your child stories about their time together, what they did, what your child did and said, and often with photos. Then when your child gets old enough to read, she can read about her life.

See also lifehack.org.