> Fertility rates in those countries are incredibly low.
Fertility in Sweden has been higher than the average EU rate for a long time (although I think it's been a bit lower recently), and that has been attributed to the generous family policies and access to cheap (and good) childcare.
480 days of tax-funded parental leave per child (caveat emptor, terms and conditions apply).
Tax-supported child care, max cost per month to parents at about $100 per child.
Parents are allowed by law to select to 75% during the child's first 7 years.
About $100 per month and child in tax-funded child benefit(?).