They say drink rasberry leaf tea in the final trimester, as it doesn't actually bring labour on, it just says to make it much faster when it has started. Other things, are eating Pineapple - but do you know you must eat 7 in one day for it to make effect? And the reason why if you eat that many it will induce you is because it will make your bowels move which should help contractions going, just like castor oil, which rumbles your stomach bowels and clears your stomach (diareahh) and all empties your uterus.
Curry - same effect as the above.
Sex - sperm softens the cervix.
xx