The filiation towards the Belgian parent (father or mother) has first to be legally established before considering the Belgian nationality for a child. Kindly read first the section BIRTH under Civil Status of this website.
If the Belgian parent (father or mother) is born in Belgium, the child born in the Philippines will automatically obtain the Belgian nationality at birth.
If the Belgian parent was born out of Belgium, the child born in the Philippines will not acquire automatically the Belgian nationality at birth. In order to obtain the Belgian nationality, the Belgian parent has to sign an official act / a declaration to grant the Belgian nationality to the child within 5 years of the establishment of the filiation (meaning maximum five years after birth, recognition or adoption). The child obtains the Belgian nationality on the date upon which the declaration is signed.
How to proceed
Click here for complete procedure