It's the things you do for them that they will never remember, and therefore can not ever thank you for, that are some of the richest moments of parenting. Some of the messiest, too.
I'm not talking about the normal diaper stuff. I'm talking about bodily discharge in motion, vaguely cannibalistic activities, and microscopic familiarity with our kiddies' anatomies. I'm talking about things that should probably not be memorialized in writing.