In the midst of isolation under COVID-19 quarantines and school lockdowns, a new “social contagion” has quietly crept into homes to infect and transform children, some parents say. It was given a name in a 2018 study: rapid-onset gender dysphoria. Now, parents are sounding the alarm. In September 2020, January Littlejohn of Tallahassee, Florida, was shocked when her 13-year-old daughter inadvertently revealed a secret. School officials wanted to know which bathroom she preferred to use “as a result of her requested name change.” More shocking was her discovery of a plan devised during a private meeting between her daughter and...