It is considered that the baby in the womb is sterile. It is not until birth that the baby has its first exposure to the mother’s microbiome while passing through the virginal canal. That, together with the microbiome in the breast milk, plays a crucial role in the onset of the immune system development. (Hence, babies born through Caesarean and/or not breast-fed have weaker immune systems). Later on in life, the microbiome is constantly being influenced by exposure to the environment. (Thus, over-sterilization and the constant use of anti-microbial soaps, etc. affects negatively the development of the human microbiome). One interesting thing to note here is that playing with dogs (but not with cats!) helps build a healthy microbiome. And last but not least, proper nutrition and avoidance of medication is another factor in keeping our microbiome healthy.
Now, we know that the microbes help digestion, immune system functioning and …