Dear Bora,
The problem with those "lasts" is that you somehow never realize they were they last until later.  Like the last time Korra called popcorn "coo-cot."  I just realized one day that she had stopped saying it and I didn't remember when.  I'm happily looking forward to not realizing it was the last time K peed in her pants.  Potty training is the worst.  Next kid I'm getting pre-house trained.  Adoption perks, am I right?
Your sister,
Kate