Police officers arrested the two Bulgarian nationals on Thursday in Neunkirchen, Saar state, police said in a statement.
The 58-year-old man and his 51-year-old wife are accused of being part of a criminal organization that sells newborn babies. Both are in custody, police said.
The case originated in Bulgaria, where authorities had issued a European arrest warrant against the couple.
The two are believed to have brought at least eight heavily pregnant women from Bulgaria to neighboring Greece.
Once the babies were delivered to Greece, the two suspects reportedly turned the newborns over to other members of their criminal gang for resale, police said. The mothers in turn were promised payment.
After thorough investigations, Saarland police authorities greeted the couple while the two were driving a car. Both appeared before the Saarbrücken District Court and are currently being held in two penal institutions, respectively in Saarbrücken and Zweibruecken.