Key Message
This study examined birth outcomes among 172,017 infants in Ho Chi Minh City, Vietnam, comparing pregnancies during the COVID-19 pandemic (April 2020-December 2022) with pre-pandemic periods. Infants with full gestational exposure to the pandemic had significantly lower birth weights (by 20.7 g) and increased risks of low birth weight, term low birth weight, and preterm birth, with odds ratios ranging from 1.10 to 1.28. These findings suggest that COVID-19 control measures were associated with adverse birth outcomes, underscoring the importance of applying lessons learned for future outbreak preparedness.