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Data on vaccination during pregnancy and breastfeeding can be limited and difficult for pregnant women to access, prompting them to turn to the internet for information. The aim of this study was to analyze common queries to create referenced fact sheets in order to facilitate access to information during primary care appointments. A non-participant netnography was used to analyze public comments posted on the most popular French internet health forums, in order to generate standardized and referenced fact sheets using a narrative review of the literature. Out of the 14,941 messages retrieved between January 2009 and March 2022, 543 messages were recorded. The five main vaccine-preventable diseases mentioned are as follows: influenza, COVID-19, whooping cough, yellow fever, and Measles–Mumps–Rubella. The topics covered are similar between vaccines, and relate to vaccination in practice, health communication, and perceptions, as well as contextual influences. The main questions relate to the benefit/risk balance, adjuvants, indications, transplacental, and breast milk transfer, as well as passive immunity. Personal beliefs (e.g., preferences for naturopathy or alternative medicine) and contextual influences (such as pharmaceutical lobbying, politics, and media) generate doubts about vaccine safety and efficiency. The contribution of independent, reliable scientific data, adapted for the transmission of consensual information by health professionals, is necessary, in a context where improving childhood immunization relies on vaccinating pregnant and breastfeeding women.