The determinants of female fertility have been largely well known (e.g. Bongaarts and Feeney, 1978; Lee, 2019), however their relative contributions to fertility change, which may vary depending on context (Lee, 2019) are not as well studied. This is particularly important in the case of the Philippines, where its total fertility rate declined by 0.8 births per woman over a course of five years, when historically the rate of decline had been about 0.5 every decade. Can this be due to timing effects as a result of pandemic jitters from the 2020 COVID-19 global pandemic? Or could this be due to changes in the country’s education system that has grown by leap and bounds over the last decade? Alternatively, has the expansion of reproductive health services in particular and health financing in general over the last decade caused this non-trivial decline in fertility? Or could there be other causes? Assessing the contribution of these sources are important in gauging the effectiveness of these interventions, as we as in designing possible remediation policies when necessary.