can enter through the patent processus vaginalis into the scrotum. Meconium periorchitis and abnormalities of the lymphatic system may also cause scrotal enlargement. Both male and female infants ...

This may be due to failure of the processus vaginalis to fully close (i.e. communicating hydrocele) or by the body’s inability to absorb the excess fluid before birth (i.e. simple hydrocele).