It helps bcuz it mimics breastfeeding. It causes ur body 2 produce oxytocin. This is linked to uterine contractions.
Nipple stimulation to induce labor releases oxytocin which is a labor hormone. Oxytocin makes your uterus contract.
I read this somewhere on google! Im also curious! :)
It seems irritating though. Nipples are probably already sore as is. I don't think this helps lol. Has anyone tried it?