Eat Pineapple
Pineapple contains active enzyme bromelain which may help soften the cervix and thereby, stimulating the smooth muscles of the uterus to naturally induce labor. It is also possible that other tropical fruits like mango, kiwi, and papaya may have a similar effect.
Eat fresh pineapple, and not the canned one as the process involved in canning tend to reduce the bromelain content of the fruit.