More than half of mainland mothers giving birth in Hong Kong opt for delivery by Caesarean sections because it allows them to plan their stays here, a local obstetrician said. Pregnant mainland women, especially those who do not have a husband in Hong Kong, do not prefer staying in the city for long, said obstetrician Kun Ka-yan. They usually stay in hospital for three to four days and spend the next two days applying for passports and identity cards for the newborn,' he said. 'Most mothers finish the whole process and go home within a week.' Mainland mothers spend an average HK$70,000 to give birth in Hong Kong, but they can save thousands of dollars by cutting their time spent in the city. A night at a Mong Kok hostel, for example, costs HK$275. 'If mothers are booked for Caesareans, they do not need to wait for labour to begin,' Kun said. An array of companies offers different 'birth packages' for mainland mothers online. Fees vary from HK$2,500 - which covers a booking at a local hospital and procurement of a child's identity documents after its birth - to more than HK$50,000 - which includes everything from cross-border transport to round-the-clock nursing assistance. Booking and time spent in a public hospital costs HK$39,000. Private hospitals cost at least 20 per cent more. More than 44 per cent of babies born in the city last year were to mainland mothers.