SLC6A4 and COVID-19: The importance of timely detection and treatment is even more emphasized by the first reports that have made their entry, indicating that higher maternal fear of COVID-19 during pregnancy was associated with a 192 g reduction in infant birthweight [104] and that greater COVID-19-related prenatal stress was significantly associated with higher infants’ SLC6A4 methylation in seven CpG sites, which, in turn, was negatively associated with infants’ temperament, in particular with the infants’ positive affect at 3 months [131].