IMHO this is even a little bit later than 1-2 years. I would say 3,5 years old is the middle point when they stop using diapers.
Anyway, let's say it is a 30k item, which it certainly is.
How you organize your life is of course up to you. Everyone will have a different approach. Here, the 20k items would include things like "child name" or "parenting" or even "parenting goals." Additionally "learning parenting", "developing sophisticated idea on parenting, education", "taking care of offspring", "helping kids with their goals", "come to agreement with SO and kids on how we live together" could be a 40k thing. It really depends on how you see life.
The NAs here, I can't see any. As far as I can tell, all the interaction with the child that falls under "potty training" (which could be at the time either a project or a 20k item or maybe even both), will be happening spontanouesly in the moment of urgency - to paraphrase Covey.
Thus it all falls into the first category of the The Threefold Model for Evaluating Daily Work, which would be "doing the work as it shows up" as opposed to either "defining the work" or "doing the work that is already defined." So, no NA reminders necessary.