> And the leaving the house/car part I also don't follow. You have one more person to dress and one more item of luggage to carry; it's hardly an exponential increase.

It's mainly that something so easy you barely think about it becomes something you do have to think about. It's a vanishingly tiny value being acted upon such that it is many times larger than it was, though still not huge. It does get worse with older kids—newborns are in many ways very easy, sleep and constant feedings aside—and I understand that some people have lots and lots of trouble with the process, though for us it's not that bad, just a non-issue that is now a once-or-more-a-day minor issue.