I don't normally post to recommend a product, but I noticed some posts about keeping a journal, so I just had to do it.
I've been keeping a 10-year journal since 2 years before, and I love it! I just write down something my son said, or what we did as a family, or whatever. I can see what we did the year before and so on today as I'm writing today's event on the same page. For example, a year ago today, my son told me that he was the happiest when he was with me:) He was also sick on the same day two years in a row. I've always kept some kind of journals, but I hardly ever look back and read them.
The only thing is that the space is limited, so you can't write a lot, but I keep a separate journal for big events like traveling, and I also have a blog for my family who lives far away, so no big deal. And, not having to write a lot actually helps me to write down something every night before I go to bed.
I wish I had started my 10-year journal when he was born. I did keep a journal everyday, but 10-year one works so much better for me.