wikipediatrician

A wikipediatrician is someone who thinks the decisions they make are the best for their child, without doing any substantial research on the given issue.

It combines the words Wikipedia and pediatrician, the pediatrician part mockingly implies an expertise in children.

The wikipedia part implies the scarce amount of actual research they did on the subjects they claim to know a lot about, also implying the reliability of the sources used (if any are used).

Karen did not vaccinate her children because she was convinced vaccines caused autism, she is such a wikipediatrician