We are used to the fact that immigrants increase the average birth rate - both in Europe and in Russia (for example, research data showed that in Moscow, among Tajiks with a Russian passport, the TFR is slightly higher than 2).
Australia is a rare example of the opposite.
Australia uses a qualifying points system to attract some of the world's best-educated immigrants. These immigrants have extremely low fertility rates, with only 1.25 births per woman in 2025.
Among women born in Australia, the TFR is 1.6, which is almost a third higher than among immigrant women.
Also, we see that women from Northeast and Southeast Asia - China, Taiwan, Vietnam, Thailand, etc. - TFR is the same or even lower than in their country of residence, 0.8-1.
This means that the main thing is not the peculiarities of life in these countries, such as the still strong patriarchy, public criticism of illegal births, etc.
Wherever Asian women live - not only in Australia, but also in the US, Canada, Europe - they show the lowest level of TFR among all women.
This is probably the result of one observation that the higher the IQ level, the lower the desire of people to reproduce. And in Northeast and Southeast Asia, people have a very high level of IQ, and even smarter people than the surrounding population leave for the Anglosphere countries.
N. b And hence the answer to the highest birth rate among the developed countries in Israel: I have already cited studies that show that the IQ level of Eastern Jews and Orthodox Christians is very low - on average 82, which is even lower than that of the Christians and Druze of Palestine, Syria and Lebanon and about the same level as the surrounding Sunni Arabs. And Ashkenazi Jews, and especially secular ones - with the highest IQ in the world, have long since become a minority in Israel. And this is also clear evidence of the dependence of the birth rate on the IQ level.