Raw data for the present study, including the following files,

• Influenza-specific IgA antibody data as MFI. The file contains the IgA antibody data expressed as MFI for a panel influenza strains generated by mPlex-Flu assay utilizing all breast milk and serum samples. (IgA_20160908_MFI.xlsx) • Influenza-specific IgG antibody data as MFI. The file contains the IgG antibody data expressed as MFI for a panel influenza strains generated by mPlex-Flu assay utilizing all breast milk and serum samples. (IgG_20160908_MFI.xlsx) • Comparison of influenza-specific IgA antibodies between paired samples. The MFI titer comparison of IgA antibody of maternal serum (MS) vs breast milk (BM) and infant’s serum (IS) over time using the Prism 7 software. (IgA version2018.pzfx) • Comparison of influenza-specific IgG antibodies between paired samples. The file contains MFI unit comparison of influenza-specific IgG antibodies of maternal serum (MS) vs breast milk (BM) and infant’s serum (IS) over time using the Prism 7 software. (IgG version2018.pzfx) • Program code for IgA heatmap. The Mathematica 2 program code for generation of the heatmap figure of IgA data of maternal serum (MS), breast milk (BM) and infant’s serum (IS) from mPlex-Flu assay. (IgA MFI Revised.nb) • Program code for IgG heatmap. The Mathematica 2 program code for generation of the heatmap figure of IgG data of maternal serum (MS), breast milk (BM) and infant’s serum (IS) from mPlex-Flu assay. (IgG MFI Revised.nb)