Table 1:

Microbial Communities Described by Type of Early Life Environmental Factors

Environmental Factors	Bacterial Community	Reference #s
Vaginal Delivery vs Cesarean Section Delivery	↑Lactobacillus ↑Prevotella ↑Sneathia ↑Bifidobacterium ↑Bacteroides ↓Staphylococcus ↓Propionibacterium ↓Corynebacterium	19,20
Breast Feeding vs Formula Feeding	↑Bifidobacteria ↑Lactobacillus ↓Clostridiales ↓Proteobacteria	32,33
Introduction of Solid Food	↑Lachnospiraceae ↑Ruminococcaceae ↑Bacteroidaceae ↓Lactobacillaceae ↓Bifidobacterium ↓Enterococcaceae ↓Enterobacteriaceae	36,37

The table summarizes the bacterial shifts during major early life events such as delivery, breast feeding, and introduction to solid food.