Why are 'mama' and 'dada' a baby's first words? What's behind the myth that storks deliver babies?
#BABY CHIN QUIVER TRIAL#
These facial gestalts may act as a kind of trial run for the facial muscles - this practice in the womb may help the baby bond with others once they’re born. In Reissland's studies, the fetuses showed these facial expressions without stimulation of any kind the expressions they observed weren’t in response to any stimulation by the researchers.įacial expressions play an important role in postnatal bonding and communication between the parent and child, Reissland said.
We also don't know that these crying motions are in any way linked to pain or discomfort in the fetus. Even if they did manage to make a sound wave in the fluid, it likely wouldn’t be strong enough to travel through the amniotic fluid and flesh of the mother. Whether they're vibrating the vocal cords and trying to make sounds in utero is not possible to know. But the fetus seems to be practicing at least the facial movements of crying before birth, preparing it to become functional when they take their first breath and let out that long-awaited wail signaling their arrival. These motions are too subtle to be felt by the pregnant parent, Reissland said. These preliminary facial expressions develop around 24 to 35 weeks, and their complexity increases with gestational age. These facial expressions - including the "cry-face-gestalt" and the "laughter-gestalt" that Reissland and colleagues defined in a paper published in the journal PLOS One in 2011 - may be precursors to the facial expressions used outside the womb. Reissland's team has analyzed the development of facial expressions in utero by watching the movements of fetuses in the second and third trimesters through 4D ultrasound imaging - 3D movies of fetal actions. Put another way, in the fluid-filled amniotic sac, fetuses can't take in a big breath, fill their lungs and vibrate the air through their vocal cords to start to wail - that will need to wait for the first visit to the outside world.
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