Answering nature's call

[emka]

I would like to know about numbers. In baby speak, doing number two is poo. Doing number three is pee.
This rhymes nicely, so no explanation needed here.
But what would be number one?

[riquecohen]

Number one is urination. There is no number three.

[emka]

That's somewhat disappointing because the beauty of rhyme does no longer apply. I heard this usage in one family, which certainly isn't a valid sample.
Good that I am well past toddler-talk age and can resort to other terminology for these urges.