With the help of video-recorded ultrasound images, the investigators found that a group of third-trimester fetuses showed evidence of “crying behavior” in response to a low-decibel noise played on the mother’s abdomen.
Fetuses showed a “startle” response to the noise, along with deep inhalations and exhalations, an open mouth and a “quivering” chin — all signs of crying.
The behavior, seen in 11 fetuses, began as early as the 28th week of pregnancy.