Adult – 15-20 billion bacterial cells per day
Infant -12 month – 1-2 billion bacteria cells per day
Toddler – 1-2 years 2-4 billion bacteria cells per day
Child – 2-4 years 4-8 bacteria cells per day
Child – 4-10 years – 8-12 bacteria cells per day
Teen – 12-16 years 12-15 bacteria cells per day
- (Gut and Psychology Syndrome, Dr Natasha Campbell-McBride)