they will more than likely respond to you about confirming your son citizenship of the Philippines or not since he was born abroad
The Hague Convention of 25 October 1980 on the Civil Aspects of International Child Abduction seeks to curb international abductions of children by providing judicial remedies to those seeking the return of a child who has been wrongfully removed or retained. The Convention provides a simplified procedure for seeking the return of a child to its legal custodian. However, there are limitations to the treaty’s application. The Convention applies only between those countries that have adopted it as “Contracting States.” Under the treaty, each subscribing state sets up a “Central Authority” to serve as a liaison with the other Contracting States. An aggrieved parent may then file an application with either the Central Authority of the home country or the country where the child is located. Upon application, the Central Authority must take all appropriate measures to discover the whereabouts of the child, prevent harm to the child, protect the interests of the lawful custodian or applicant, and secure the voluntary return of the child.

If a judicial proceeding is initiated, the court must act expeditiously. Article 11 gives the applicant or the Central Authority of the Requested State the right to demand a statement from the court detailing the reasons for delay if a decision has not been made within six weeks from the commencement of proceedings. There need not be a custody decree in effect in order to trigger the return provisions under the Convention.

The elements of a cause of action for the return of an abducted child under the Hague Convention on the civil aspects of child abduction and International Child Abduction Remedies Act (1) are that:

# the child was habitually resident of the country from which the child was abducted;
The petitioning parent had either sole or joint rights of custody of the child either through a custody order or du jure (by operation of law), and
At time of wrongfully removal, the petitioning parent was exercising those rights. #
here is the address of the Italian Hague convention bureau in Italy :
ITALY:
The Registry of the Court of Appeal
Rome, Italy

L”Ufficio unico degli ufficiali
giudiziari presso la corte d”appello la corte
d”appello di Roma
Rome, Italy
did you get a divorce ? or has she just left and not come back with the child ?
you could also try to contact the Philippines gov. to see if they can, perhaps do something or inform you ?
here is their home page :