The baby boy reportedly born out of an incestuous relationship between an 11-year-old girl and her 14-year-old brother, has been taken into care.
Local social services chiefs have secured temporary guardianship of the five-day-old tot while his long-term future is decided, the Daily Mail reports.
The child mum has also been separated from her family including her older brother after leaving hospital in Murcia, south east Spain. She is now staying with a temporary foster family.
Her baby's whereabouts have not been disclosed, although local reports said he could be taken taken to a child protection centre or end up in emergency foster care or with extended family.
The measures have been taken while police await the result of DNA tests to confirm the siblings are the parents of the baby and social services bosses carry out their own independent investigation.