Alliance for Pandemic Preparedness

April 26, 2021

Maternal and Child Outcomes Reported by Breastfeeding Women Following MRNA COVID-19 Vaccination

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  • [Pre-print, not peer-reviewed] Among individuals who were breastfeeding and received an mRNA SARS-CoV-2 vaccine (n = 180, 71% Pfizer-BioNTech, 29% Moderna), >85% reported experiencing side effects following either dose. Those who received the Moderna vaccine were significantly more likely to report systemic side effects after the second dose like fever, chills, and vomiting, in addition to localized injection site reactions. Some participants also reported a reduction in milk supply, which in all cases returned to normal within 72 hours. Few events were reported for children after the second dose, and all were non-serious, including irritability (10% for both vaccines), poor sleep (8% for both vaccines), and drowsiness (0% for Pfizer vs. 6% for Moderna).

Bertrand et al. (Apr 25, 2021). Maternal and Child Outcomes Reported by Breastfeeding Women Following MRNA COVID-19 Vaccination. Pre-print downloaded Apr 26 from https://doi.org/10.1101/2021.04.21.21255841