Olubunmi Oke, a reporter and newscaster with the Nigerian Television Authority (NTA), was taken Thursday by four men who blocked her car as she was leaving her office in Akure, capital of the southwestern Ondo state.
"The matter has been brought to the notice of the Nigeria Union of Journalists (NUJ) and we are making efforts to ensure her safe return," NUJ secretary-general Shu'aibu Usman Leman told AFP.
The abductors made away with Oke in her car but later let her baby and maid go, the sources said.
The car was later found in a nearby town, they added.
The police were unavailable for comment.
Kidnappings are frequent in oil-rich southern Nigeria, mostly for ransom, and more recently in northern parts of the country by members of the Islamist extremist group Boko Haram, or its offshoot Ansaru.
But it is rare in southwest Nigeria, where the journalist was kidnapped. The reason for her abduction is not known.