<prompt> First antibody produced by newborn?IgAIgGIgEIgM  <response>: Ref: Microbiology by Ananthanarayan 9th ed. 198-99 First antibody produced by newborn is IgM at 20 weeks age of gestation. Immunoglobulin that can cross placenta: IgG1 Immunoglobulin that is present in breast milk: IgA 