It’s one of the cliches of parenting that kids grow up fast. One minute you’re dreading dealing with diapers, the next you’re teaching them how to drive their flying cars (these have gotta happen eventually, right?).
Not only is everyone aware of this belief, pretty much everyone accepts it as well, whether they have kids themselves or not. Of course, once someone does have kids it’s no longer just a belief; it becomes immediately apparent that the cliche is 100% true. So much so that that terrible sitcom convention – wherein an older couple suddenly decides they want a new baby, usually after the mom is exposed to someone else’s kid (and always because the show needs an infusion of cute) – suddenly makes perfect sense.
Except Oliver. That kid sucked.