ABSTRACT Using longitudinal surveys on married Singaporean women of childbearing ages, we compared self-reported changes to fertility plans among 407 and 345 respondents after the 2016–2017 Zika and 2020 COVID-19 outbreaks, respectively. Zika associated with intentions to delay but not reduce childbearing, while COVID-19 was associated with both. Some women reported accelerating and increasing childbearing during COVID-19, with more intending to bring forward births as the pandemic persisted. Education was more predictive of changes in fertility plans during the pandemic compared to the Zika epidemic, and women who delayed childbearing due to Zika were more likely to further adjust timing of childbearing during COVID-19. We considered three possible explanations for changes to fertility plans: fear of infection, change in subjective wellbeing, and income loss, and find stronger effects of perceptions of the virus on downward revisions of fertility plans after the Zika epidemic but a larger role for stress and income loss during the pandemic, reflecting the latter’s wider economic and social impacts.