system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
First antibody produced by newborn?
assistant
The correct answer is  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