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3D images show how a baby's head is squooshed during childbirth



Mothers are sorry. The cost of a child is not just extortionate, but the human pelvis is also not very well suited for the actual birth process of large-headed newborns.

One of the ways that man has gone to circumvent this narrowness -Dilemma pelvic big head with a soft, malleable skull that fuses and hardens at some point between seven and 18 months. This muddy skull can change under pressure and squeeze through the birth canal.

Now, scientists have shown by using 3D scans how the fetal brain changes shape during birth. The results were published in the journal PLOS ONE.

Twenty-seven pregnant women were scanned by MRI between the 36th and 39th week of gestation. Seven of these women were scanned again, at least 1

0 minutes before delivery.

The resulting images show, to varying degrees, what they call "fetal head molding" and show marked differences between the first and second image sets. While none of the 27 images in the first set showed overlapping fetal structures, all seven in the second set showed how the brain shape changes during labor to fit through the birth canal.

3D scans of the fetus before labor (purple: A, C, E) and during the second phase of the work (orange: in B, D, F). Picture credits: Ami et al. 2019, Plos One

Immediately after birth, this "skull deformity" was no longer visible in five of the seven babies. The parameters of their skulls were "identical" to those they had had in the womb.

Among the three newborns with the most prominent skull shape (and the most severe deformations of the brain shape), two were born by caesarean section and one by natural birth.

3D finite element reconstruction of the cranial bones before labor (A, C, E) and during the second labor phase (B, D, F) in a fetus. Picture credits: Ami et al. 2019, Plos One

In 2017, photographer Kayla Reeder took some incredible pictures of a baby named Graham, whose lateral positioning led to extreme skull injuries. But do not worry – in this case, the baby's head has regressed to a normal shape, showing how complex (and flexible) the human body really is.


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