Before revision:  We report the most encompassing set of fetal HRV measures known to-date and identify those HRV measures that are specific to the vagal modulation of HRV and show recovery dynamic due to fetal surgery.
After revision:  The fetal heart rate did not change due to vagotomy. We identify fHRV measures specific to the vagal modulation of HRV and show recovery dynamic due to fetal surgery.