One thing I very much regret is never getting going on keeping a running log of the hilarious things my kiddos have said over their short lifetimes. Especially taking into account my not so great memory this was not a good thing. We could have filled volumes. I am talking the size of those old Encyclopedia sets everyone used to have.
Christina and I HIGHLY encourage you to do so. I prefer an actual written log, but whatever you do start today and make sure that you make keeping it up to date a priority. Save a reminder in your phone, write it on your hand, whatever.