You may want to trigger labor for several reasons you may have reached your 40th week of pregnancy and you want to see your baby quickly or you may be worried about premature labor. While there is no scientific evidence that certain foods trigger labor it cannot hurt to try some of these options. Here are 12 ways to induce labour naturally.1. Pineapple: The enzyme bromelain present in pineapple stimulates smooth muscle and softens the cervix. Only fresh pineapple does the trick because the enzyme is destroyed in the canning process. According to a 2009 study published in Complementary Therapies