It's not because you are born in Belgium that you are Belgian,
A Chinese born of Chinese parents in Nigeria is still Chinese
A Nigerian born of Nigerian parents in Sweden is still Nigerian
A Sweed born of Swedish parents in Morocco is still Swedish
A Moroccan born of Moroccan parents in Belgium is still Moroccan
A Belgian born of Belgian parents in Congo is still Belgian
it is as simpel as that!
Belgium, a country in Western Europe, is known for medieval towns, Renaissance architecture and as headquarters of the European Union and NATO. The country has distinctive regions including Dutch-speaking Flanders to the north, French-speaking Wallonia to the south and a German-speaking community to the east. The bilingual capital, Brussels, has ornate guildhalls at Grand-Place and elegant art-nouveau buildings.
Legally, Belgium is a sovereign state and a federal constitutional monarchy with a parliamentary system. Its institutional organization is complex and is structured on both regional and linguistic grounds. It is divided into three highly autonomous regions: Flanders in the north, Wallonia in the south, and the Brussels-Capital Region.
A dog born in a stable isn't a horse!
Belgium is a nation of Ethnic Flemish (Germanic) and Ethnic Walloon (Latin) peoples, just being born here or holding a pasport, does not make you Belgian, just as Belgians when they are born in Congo, which is a country of Bantus and Pygmies will never be Congolese. It is a simple as that!