There is no doubt twins have a special bond and, as this video shows, it is something that can be present from birth.
The clip, filmed by US dad Lonie Paxton, shows the moment babies Reese and Rylan are delivered by caesarean section.
As most babies do, the brother and sister start crying almost immediately after being removed from their mother's womb.
The pair continue to cry while medical staff make sure they are breathing properly and clip their umbilical cords.
However once they are placed next to each other the babies quieten, appearing to take comfort in each other's presence.
The heart-melting clip has been viewed more than six million times since the proud parents uploaded it to YouTube.
Reese and Rylan are now three years old and their bond appears to be just as strong. Dad Lonie, a footballer who also works for Go-Pro, shares their adorable photos on his Instagram page.