A 20-year-old woman from Madagascar, suspected of having given birth on the flight, was arrested.
The Air Mauritius plane, which arrived from Madagascar, landed at Sir Seewoosagur Ramgoolam International Airport on 1 January.
Airport officers made the discovery when they screened the plane for a routine customs check.
They rushed the baby to a public hospital for treatment.
The woman suspected of being the child’s mother, who initially denied the boy was hers, was made to undergo a medical examination which confirmed that she had just given birth.
Both she and the baby are said to be doing well.
The Malagasy woman, who arrived in Mauritius on a two-year work permit, will be questioned after her release from the hospital and charged with abandoning a newborn.
Mauritius is a subtropical island country in the Indian Ocean, just over 1,130 kilometres east of Madagascar, off the south-eastern coast of Africa. Its outlying territories include Rodrigues Island and other smaller islands.
Source: BBC News