FIG 1.

Bacterial composition in early and late stool samples. The diagram shows the relative abundances of bacterial genera in stool samples collected at early (<14 days) and late (3 to 4 weeks) time points of postnatal age. Late stool samples had increased bacterial diversity compared to the early stool samples. The early stool samples were dominated by Staphylococcus. The later stool samples showed increases in the abundances of Gram-negative bacteria (Escherichia, Klebsiella, and Veillonella) and beneficial bacteria like Lactobacilli and Bifidobacteria.