It would be interesting to see a comparison of the fertility rates in the western European part of Turkey and the eastern fundamentalist part of Turkey.
I have not seen data on fertility rates across different regions within a nation (except for state-level US data).
Worldwide, the birth rate has been dropping since the 1960s. The US birth rate had a slight rebound during the pandemic, jumping from 1.66 (in 2021) to 1.7 (in 2023) births per woman. But this is still far below the replacement rate of about 2.3 births per woman. Turkey has a higher birth rate than the US, but is still below replacement level.
The highest birth rates are in African countries, but those are also the countries with the highest child mortality rates. People have more children to offset high child mortality rates.