Infants are the drill sergeants of parenting bootcamp. They give you four basic tasks - diapers, burping, feeding, and napping - and then scream at you when you do them wrong. There's no encouragement, no smiles, just crying and quiet. And they give you tasks at any time, day or night. Just finished changing my diaper? Change it again. Good job, now change that one.
After a few months of breaking you down, they build you back up again. They smile at you. They sleep through the night. They hold their head up, so you don't have to.
And after It's over, the tasks you learned - swaddling, diapering, bottle prepping - are tasks you will likely never use again. But the skills you've gained - patience without sleep, calm in the face of screams, moving your hand into the shit instead of recoiling - are skills that will serve you the rest of your life.