A baby was delivered by Caesarean section after his 30-year-old mother suffered life-threatening injuries when the family's car was in a head-on collision with another vehicle in Kowloon City on Tuesday night. The newborn was in serious condition in Queen Elizabeth Hospital last night. His mother, So Wai-see, and father, Shum Wai-po, 36, were admitted in critical condition after the accident. Also injured were the couple's two daughters, aged four and seven, and an off-duty policewoman who was driving the other car involved in the crash. A government spokesman said the couple's younger daughter was in serious condition. The eldest daughter had been discharged after treatment. The accident happened minutes before the No8 typhoon signal was issued at 10.45pm on Tuesday. Mr Shum was driving his Mitsubishi Lancer Evolution along Prince Edward Road East, heading towards his home in Sai Kung, according to police. The policewoman, 24, was on her way to Sham Shui Po police station to report for duty at the time of the crash. A police investigator said it appeared Mr Shum's car had crossed into the opposite lane when it reached a Prince Edward Road flyover near Fuk Lo Tsun Road. 'It's possible that the man lost control of his car on the rain-soaked road while he was in a hurry to return home before the No8 signal went up,' the officer said. Police said the officer involved in the crash passed a breathalyser test.