It has nothing to do with what the body “knows”. It’s just forces acting on objects. Think of submerging an object in water. The water doesn’t “know” where to go, it just gets displaced. When you remove the object, the water flows back into place.
As the fetus grows, it exerts force upon surrounding organs, pushing them out of the way. When that force is gone, things naturally return to (more or less) where they were before. It’s just physics.
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