I agree. And the study actually points out that "There was no significant between-group difference in the incidence of serious adverse events." It's important

I agree. And the study actually points out that "There was no significant between-group difference in the incidence of serious adverse events." It's important to remember how vital early introduction to both beneficial and harmful environmental agents are to human development. Its easy to have the mindset that I will wait until my child is 3+ years old before I introduce anything potentially harmful with the idea being that they will be bigger and stronger. The immune system is actually quite strong and adaptable early in development which is precisely why vaccines work better at an early age That being said the parent (esp mother) also plays a large roll in the first introduction of helpful bacteria that break down various foods. The bacteria that are transferred during a vaginal birth give the baby a leg up in establishing its early gut flora. Additionally there is a direct transfer of antibodies through the placenta and breast milk which help protect the baby. I would imagine a mother eating peanuts during both those times would help pass some of these antibodies to her offspring. https://en.wikipedia.org/wiki/Passive_immunity https://en.wikipedia.org/wiki/Passive_immunity