A new study in Italy showed recently that twins, while in utero, make deliberate and directed movements to touch each other from the 14th week of gestation.
This is the first time that a study of twins in the womb showed that they touch each other intentionally. In the past similar studies were conducted past the 11th week of gestation, but only examined reflex actions, LifeSiteNews reported.
The new study was conducted by Dr. Umberto Castiello, University of Padova and his associates, using advanced ultrasonography that recorded the movement of the twins in 3D, LifeSiteNews said.
In the study, the researchers said, “Unlike ordinary siblings, twins share a most important environment – the uterus. If a predisposition towards social interaction is present before birth, one may expect twin fetuses to engage in some form of interaction,” LifeSiteNews reported.
Methodology
The premise of the study recognizes that when babies are born, one-to-one interactions are the beginning of social cognition. But, the study said, babies can’t develop just by watching, but need to also touch and have reciprocal interactions, like copying facial movements.
The study questions further, do babies have a propensity to interact even before birth, when they are still in the womb? The study differentiated reflex movements from intentional movements, referring to a 2007 study by Zoia et. al.
In the Zoia study, 22-week-old fetuses were seen in utero to have three hand movements that were goal directed, namely “movements ending at contact of fingers with the mouth, movements ending at contact of fingers with the eye, and movements directed away from the body, towards the uterine wall.”
In the experiment, five pairs of twins from low-risk pregnant mothers were examined in utero on the 14th and 18th weeks of gestation. Each recording session was 20 minutes long, LifeSiteNews reported.
On the 14th week the twins were seen touching themselves and the uterine wall. There was also contact “head to head, head to arm and arm to head,” the study said. However, from the 15th to 22nd week, “intra-pair contact becomes a constant and increasing feature of all twin pregnancies.”
LifeSiteNews reported that interest in their twin rose three times as high, and 30 percent of total movement was aimed at the sibling. The movements also lasted longer, LifeSiteNews said.
The study said “[Between the 14th and 18th weeks] kinematic analysis revealed that movement duration was longer and deceleration time was prolonged for other-directed movements compared to movements directed towards the uterine wall. Similar kinematic profiles were observed for movements directed towards the co-twin and self-directed movements aimed at the eye region.”
The study showed that the increase of movement towards the twin was consistent among all sets of twins that were examined in utero adding, “When the context enables it, as in the case of twin fetuses, other-directed actions are not only possible but predominant over self-directed actions,” LifeSiteNews reported.


