In reply to goldmember:
Well a scheduled c-section would probably be the most obvious.....
Otherwise go shopping and buy a new item of maternity clothing. The more expensive the item the faster the baby will arrive afterwards. And if it doesn't work at least you have something new to wear, because by this stage you will be so fed up of wearing the same maternity clothes for about the last three months even a new t-short will be a good thing. Worked for me, bought a new top, baby arrived next day!
I realize this question is from a man, but you can pass on the advice.