Changes in the quantity and quality of births after the COVID-19 pandemic: an interrupted time series analysis of two million births in Southwest China.

Pre-pregnancy body mass index of reproductive-age women shifted from an increasing trend in the pre-epidemic period to a declining trend in the post-pandemic period (β=-0.05, 95%CI: -0.10 to -0.01, P = 0.039), in line with the accelerated decline of birth weight nine months later.

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