The best way is to wait and let it happen naturally. Babies need as much time in the womb as possible in order to develop properly. While 37 weeks is considered full-term there is still a fairly decent chance of your baby having some kind of respiratory problem if he's born this early. I'm sure you're impatient and probably uncomfortable, but you need to let him come on his own. Besides, all the natural ways to encourage labor absolutely do not work unless your body is already beginning the process. Trust me on this, I tried them all with my daughter, they're all a waste of time if your body and baby aren't ready.But, if you really want you can eat fresh pineapple, spicy food, try acupressure massage, walking/jogging uphill or up stairs. Stay away from castor oil, doctors don't recommend you try it as it causes side effects like extreme nausea and diarrhea.