Vaccines for young children are being delayed by incomplete data, a top F.D.A. official suggests. April 26, 2022 Auto Bot BioNTech SE, Children and Childhood, Clinical Trials, Coronavirus (2019-nCoV), Food and Drug Administration, Moderna Inc, Pfizer Inc, Vaccination and Immunization 0 Moderna and the Pfizer-BioNTech partnership are developing versions of their coronavirus vaccines for children under 5, with emergency-use filings expected soon.