A 15-year-old boy has been charged with manslaughter after a heavily pregnant woman was killed in a crash involving an allegedly stolen car in central Hobart.

The woman, who was 32 weeks pregnant, died at the scene and her baby was delivered at the Royal Hobart Hospital.

The 24-year-old woman had dropped her partner off at work and was driving with her two-year-old son inside the car when the crash happened about 1:00am on the corner of Davey and Argyle Street.

Her son received minor injuries and police said specialists were treating the newborn.

The teenager, who is alleged to have been the other driver, was questioned while under police guard in hospital.

He has been charged with one count of manslaughter and one count of motor vehicle stealing and is due to appear at the Hobart Youth Justice Court.

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