Earlier quoted context omitted.
Yes, the problem is not dairy vs. non-dairy, it is with feeding kids who have been weaned a vegetarian or vegan diet in general. For instance, the following is a recent study (July 2020): Vegetarian and Vegan Weaning of the Infant: How Common and How Evidence-Based? A Population-Based Survey and Narrative Review Background: Vegetarian and vegan weaning have increasing popularity among parents and families. However, i…
That's certainly an interpretation of that study. Here's another one. > Almost half of parents (45.2%) claim that their pediatrician was unable to provide sufficient information and adequate indications regarding unconventional weaning and 77.4% of parents reported the pediatrician’s resistance towards alternative weaning methods. > Our results show that alternative weaning methods are followed by a significant numbe…
I think your "other words" are deviating very significantly from the letter of the article and you're adding your own interpretation to what's actually written. As actually written, the article says that "the family pediatrician was not perceived as an appropriate guide" by the families Note the "perceived". This may be because the families have different ideas about a healthy diet than the pediatrician, for example "77.4% of parents reported the pediatrician's resistance towards alterantive weaning methods". Since those "alternative weaning methods" may include anything from a vegan weaning to feeding one's child beneficial moon rays (while simultaneously protecting her from the evil dark rays of death), I am inclined to believe that the problem is not that pediatricians are not adequately informed, but that parents are adhering to information from inadequate sources.
There are plenty of articles in the mainstream press by doctors who lament the fact that their patients will trust charlatans who sell them energy therapies and other such snake oil treatments, instead of the doctors themselves. Those doctors are usually specialists (for example, oncologists) but their patients still think the charlatans know best.