Fig. 2

Percent abundances of bacterial phyla in breast milk identified by 16S rRNA sequencing. a The relative abundances of different phyla in different breast milk samples were visualized by bar plots. b Box plots of the four phyla identified in breast milk. The box signifies the 75 % (upper) and 25 % (lower) quartiles and thus shows where 50 % of the samples lie. The black line inside the box represents the median. The whiskers represent the lowest datum still within 1.5 interquartile range (IQR) of the lower quartile and the highest datum still within 1.5 IQR of the upper quartile. Outliers are shown with open circles. As shown, four phyla are represented in breast milk and present in all samples, with Proteobacteria and Firmicutes being the most abundant