Vanhanen said that while the number of ISIS returnees is low now, more children could emerge as the caliphate crumbles.
More than 80 people, including 30 children, have travelled from Finland to conflict areas in Syria and Iraq, according to the Finnish Security Police (SUPO).
Finland's Interior Minister, Kai Mykkänen, has said that while Finland will not prevent the return of nationals who left the country to fight with ISIS, it will not extend help to people who have left either.
She said she had gone into Isis territory with her husband and that she has several children and wants to return to Finland.
Mykkänen said Finland does not intend to help Sanna or her children return to Finland.