THE GUT PLAYS AN IMPORTANT
ROLE IN IMMUNE DEVELOPMENT

Newborn immune system is not yet fully functional.
It needs to learn to defend against pathogens and tolerate harmless substances.

Contains 70-80% of the human body's immune cells and 100 trillion bacteria (the gut microbiome)

Gut epithelial barrier is part of the first line of defense

References:
1 Martin 2010
2 Wopereis 2014
3 Furness 1999