My understanding is your uterus is basically a huge muscle. Think about your uterus as one of those stress balls that you squeeze and your body is squeezing your uterus to push the baby down and out. And contracting smaller so the baby has to come out.

@californiahaley, how do they start from where

your body starts them its basically like a ball that squeezes and pushes to make ur uterus smaller causing the pain and the pressure

Like what so they feel like or why/when your body starts them?