Summary of the Public Assessment Report for COVID-19 Vaccine Pfizer/BioNTech - GOV.UK (www.gov.uk)
"In the context of supply under Regulation 174, it is considered that sufficient reassurance of safe use of the vaccine in pregnant women cannot be provided at the present time: however, use in women of childbearing potential could be supported provided healthcare professionals are advised to rule out known or suspected pregnancy prior to vaccination. Women who are breastfeeding should also not be vaccinated."
"Administration of the COVID-19 mRNA Vaccine BNT162b2 in pregnancy should only be considered when the potential benefits outweigh any potential risks for the mother and foetus."
"It is unknown whether the COVID-19 mRNA Vaccine BNT162b2 is excreted in human milk."