60k kids have avoided peanut allergies due to 2015 advice, study finds

>A decade after a landmark study proved that feeding peanut products to young babies could prevent development of life-threatening allergies, new research finds the change has made a big difference in the real world.

I am sorry, but am I going crazy?

We have been giving infants small amounts of peanut butter, egg etc... for decades where I live. But also let them play outside, get dirty put stuff in their mouths to train the immune system.

This is common knowledge to me.

Sometimes things are common knowledge, but don't necessarily have longitudinal studies to back them up. I think a significant number of people have thought it to be common knowledge, but now there are large studies backing this up as well.