Rosberg has travelled to Belgium for the Grand Prix weekend at Spa-Francorchamps but could depart at any time.
[PRACTICE REPORT: Nico Rosberg outpaces Lewis Hamilton in FP1 at Spa]
German newspaper Bild reports that “60 kilometres away in Liege, a private jet is waiting.
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“So too is a driver, to bring Rosberg quickly to the airport if necessary."
Mercedes boss Toto Wolff told reporters in Belgium: “When the baby comes, Nico may fly back immediately."
Rosberg, who is 21 points adrift of Mercedes team-mate and double world champion Lewis Hamilton, spent the August break at home preparing for the child’s arrival.
“Everything's packed, the car engine was running in the garage,” he told reporters in Belgium.
“The baby seat is in the Mercedes ML and it took me two hours to put it in there. It was one of the toughest recent experiences.”
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