I will call BS as well.
Don't see anything wrong with it and it does build immunity.
Babies that get raised in bubbles tend to get a lot more sick more often.
Yup! I grew up with two english pointers - they passed when I was 17 (Susan) and then at 19 (Rocket) and I have a photo of them with me still in nappies visiting my grandparents in Izingolweni (south coast).