Sydney has baby deserts and diaper valleys.
For every three babies born in Lakemba or Wiley Park, less than one baby is born in Surry Hills or Darlinghurst.
Statistics from the Australian Bureau of Statistics reveal the country's fertility rate has plummeted to its lowest level since the beginning of the century over the past six years.
Australia's current fertility rate of 1.75 is not enough to maintain a generation-to-generation balance.
Lebanese, Pakistani and Samoan mothers support fertility rates, giving birth to three to four children per mother.
Fertility has fallen by 9% since 2011, after Costello's famous slogan, "one for Dad, one for Mother, one for the country," followed a small upsurge in fertility.
The Sydney fertility rate is now the lowest in all of Australia's capital cities, down 15% over the past six years.
It is well below the level of natural change, meaning that the total population of Sydney would have been reduced if it had not emigrated.
Melbourne, the second-lowest fertility rate in capital cities, has fallen 4% over the past six years.
Like Sydney, Melbourne's total population would have fallen without immigration.
Where's the baby?
Sydney's inner city is a baby desert.
Sydney-Haymarket-Rocks has 31,000 residents, but only 254 babies were born last year.
Other areas with very few babies include Potts Point,Woolloomooloo,Darlinghurst,Redfern and Surry Hills..
The baby's hot earth is in the south and west of Sydney.
Lakemba (fertility rates of 2.93), Wiley Park,Bankstown South and Lethbridge Park are among the highest in Sydney.
Sydney's most declining fertility rate is among women between the ages of 20 and 24, which has fallen more than 25% since 2011.
At the same time, the adolescent fertility rate has also dropped by 42%.
But some communities in Sydney continue to have children early.
Lebanon-born women in their twenties have a fertility rate of six times that of Australian-born women of the same age.
The birth rate of Sydney women aged 25 to 29 has fallen 16.4 percent in the past six years and 7.6 percent in their 30s.
The current heated debate in Australia focuses on permanent immigration and infrastructure that do not keep pace with population growth.
But the reality is that without the babies born to immigrants, the population will soon begin to shrink.
"it implies that young people are no longer confident that society can provide them with enough children to replicate the existing population." Self demographer Bob Birrell says.
Cultural change worked, but Birrell believes that the most fundamental reason for this change is the economy.
According to the Australian Institute of population Research, the proportion of couples aged 30 to 34 renting homes in Sydney and Melbourne has increased by 5 percentage points over the past eight years due to a sharp rise in house prices.
"it's hard for them to find a family with a good rental to raise a family," he said.
"there is a very obvious correlation and causal relationship."