"Even though there's not much data... we know that the vaccine protects, and knowing the increased risk of bad outcomes with COVID-19 during pregnancy, to me it's clear the benefits of vaccination outweighs the theoretical risks." There's no data on the safety of the vaccine in lactating people or the effect of the COVID-19 vaccine on breastfed infants, but the CDC advises the vaccine is not thought to be a risk to infants who are breastfed.