the difference between having your first baby and your third baby...

...is that you would NEVER be holding your first baby while she slept six full months after she was born and happen to notice something in her pretty little belly button that upon closer inspection turned out to be quite a significant amount of umbilical cord remnants. You would never sit around trying to remember the last time you gave her pretty little belly button a good washing, only to realize that you just hadn't bothered to do that yet.

There is a good chance this could, however, happen with your third.