Study finds 4am is most common time of day to give birth

More babies born through spontaneous labour are delivered between 1am and 7am than at any other time of day.
More babies born through spontaneous labour are delivered between 1am and 7am than at any other time of day. Photo credit: Getty

The Prime Minister's due date has arrived - and all around the country, Kiwis are wondering when she'll have her baby.

And just in time, a study has found it's more likely to be at a certain hour - 4am, to be exact.

The analysis of 5 million births between 2005 and 2014 was carried out by University College London.

It found that more babies born through spontaneous labour are delivered between 1am and 7am than at any other time of day.

University College London applied statistics professor Dr Peter Martin says there may be an evolutionary reason for spontaneous births skewing to the late night and early hours of the morning.

"Our ancestors lived in groups that were active and dispersed during the day, and came together to rest at night," he told BBC.

"So a night-time labour and birth probably afforded the mother and newborn baby some protection."

Additionally, planned C-sections usually occurred on weekday mornings, while births after induced labours tended to happen around midnight.

More than 70 percent of births happened outside of regular working hours.

While this study only looked at births in England, it does give an interesting glimpse into today's birth trends.

However, only time will tell when New Zealand's first baby will arrive.

Newshub.