The number of births fell 5.1% from a year earlier to 758,631, while the number of marriages slid 5.9% to 489,281 -- the first time in 90 years the number fell below 500,000 -- foreboding a further decline in the population as out-of-wedlock births are rare in Japan, Reuters reported.
Asked about the latest data, Japan's top government spokesperson said the government will take "unprecedented steps" to cope with the declining birthrate, such as expanding childcare and promoting wage hikes for younger workers.
"The declining birthrate is in a critical situation," Chief Cabinet Secretary Yoshimasa Hayashi told reporters. "The next six years or so until 2030, when the number of young people will rapidly decline, will be the last chance to reverse the trend."
Mindful of the potential social and economic impact, and the strains on public finances, Prime Minister Fumio Kishida has called the trend the "gravest crisis our country faces", and unveiled a range of steps to support child-bearing households late last year.
Japan's population will likely decline by about 30% to 87 million by 2070, with four out of every 10 people aged 65 or older, according to estimates by the National Institute of Population and Social Security Research.