Q proof? Household cleaner push. Baby hands in mouth the start?
https://amp.cnn.com/cnn/2018/09/17/health/disinfectants-baby-gut-microbiota-bmi-study/index.html
Multi-surface cleaners and other commonly used household disinfectants could be making children overweight by altering the bacteria found in their guts, a new study published Monday in the Canadian Medical Association Journal suggests.
Infants living in households where antimicrobial disinfectants are used at least weekly were twice as likely to have higher levels of the bacteria Lachnospiraceae at ages 3 to 4 months than children whose homes did not frequently use disinfectants, the Canadian researchers found. When those children with higher levels of Lachnospiraceae were 3 years old, their body mass index (BMI) was higher than children who do not live in homes that frequently use disinfectants, the study also showed.