I am not sure if I will be able to adequately explain this for non-parents, but bear with me.
You are standing and watching your child sleep - their miniature motions and rustlings - and realizing that one year ago today, the human being in front of you was in all likelihood still an even power-of-two number of cells. Just beginning. A very slow, very small Big Bang, still expanding in front of your eyes and creating an entire universe of new rules and physical constants.
And then, just as this metaphor occurs to you, the child lets out a resounding fart that makes the cat turn his head. It sounds uncannily like a truck hitting the air brakes in your kid’s diaper.
That’s parenthood for you, alright.