I don't think these are what you want in terms of humorous and they might be too poetry-try but I looked at some poems in my books and found some I like that are about parenthood. Or at least motherhood:http://www.scottishpoetrylibrary.org.uk ... poems/lovehttp://www.scottishpoetrylibrary.org.uk ... ems/stance
Sorry, pressed submit before finishing. Also:
Already you are moving down.
Already your floating head engaged in the inlet from where you will head out.
Already the world, the world.
And you are slipping down, away from my heart.
That's by Victoria Redel from this website: http://www.ivillage.com/forums/node/509999
Kinda maybe too serious though, methinks. But just some starters.