From the site sited by Jon

[Wilson Gray]

On Sun, Apr 29, 2012 at 7:21 PM, Jonathan Lighter
<wuxxmupp2000 at gmail.com> wrote:
> Does that mean "hubby *and* baby daddy"

Yes. Everybody knows cares - I don't - knows who they are and that
they're married, but, given that the birth of the baby preceded the
wedding, it doesn't necessarily follow that the husband is also the
father of the baby. Hence, the clarification. In fact, that wouldn't
follow, even if the baby hadn't been born until after a year into the
marriage.

Youneverknow.
--
-Wilson
-----
All say, "How hard it is that we have to die!"---a strange complaint
to come from the mouths of people who have had to live.
-Mark Twain

------------------------------------------------------------
The American Dialect Society - http://www.americandialect.org