This is irresponsible "journalism" and your so-called "experts" are brainwashed by mainstream thinking as well as dairy propaganda.
Ethics aside - as we know the horrors that happen in the non-Vegan "food" industry" as well as the impact on climate change - more and more real experts promote an exclusively plant-based diet at ALL stages of life for health as well as longevity.

The Physician's Committee for Responsible Medicine is an organization made up of over 20,000 Vegan doctors.
Please read:
http://www.pcrm.org/health/diets/vegdiets/vegetarian-diets-for-children-right-from-the-start