The 30-second clip reveals the second stage of labor in which the mother must actively push the fetus from her womb. Taken from the side view of the uterus, the video shows the fetus as it descends down the birth canal. However, the recording was stopped just as the newborn’s head emerged, so that the child’s ears would not be exposed to noise from the MRI.
The technique involves stringing together repeated MRI images of the same part of the body to create the final cinematic video.

although I do worry about the effects of babies and MRI's even while still inside the mother