A vertical bulge down the midline of the abdomen can be seen in many newborns when intra-abdominal pressure increases. In this photo, a shadow lateral to the bulge can be seen going up the left side of the abdomen, starting near the umbilical clamp. Diastasis recti is caused by a relative weakness of linea alba "the fascia between the two rectus abdominus muscles".
It is essentially a cosmetic condition, with no associated morbidity or mortality .As it is not a herniation and is not pathologic, No treatment is needed ..... with time, this will disappear.
Another newborn has more pronounced diastasis recti. Spontaneous resolution is still expected.
