system
Given the following post, respond as if you're commenting on Reddit:
human
Humans have 'friendly' bacteria that live in their gut. There are four dominant phyla present. How did they get there? If it was based on diet, surely people from different parts of the world would have different bacteria in their gut?
gpt
Gut bacteria are introduced through the mother to the baby during birth. Babies usually come out headfirst and mouth open. They are inoculated then. Later other bacteria can be introduced when the baby ingests them as food or by putting things in their mouths.