A glance in the mirror will show you how much your body expands when you’ve got a bun in the oven. But how much do you really know about what’s going on inside? As it turns out your growing baby isn’t the only thing that’s moving around in there. Check out the animated video below to discover exactly what’s happening inside your pregnant body.

Created by the Museum of Science and Industry in Chicago, this video animation shows you exactly how your body makes room for that growing uterus. Your organs actually migrate from their usual locations, which is probably what accounts for that lovely feeling like you’ve got something constantly squashing your bladder — not to mention the non-stop indigestion.

The more science learns about the female body during pregnancy, the more we learn how truly amazing women are. But then again, we already knew that.