On June 23rd of 2020, an online meeting was held with the primary investigator and managerial and executive members of the PERSIAN Birth Cohort. In this meeting, the process of data quality assessment was explained. Missing data was detected and the protocol for evaluating and identifying the missing data was discussed. Then, the effects of COVID-19 on the study process were debated and locals were encouraged to hold online meetings/webinars with the study participants to answer their questions on the process of child growth and development. At last, managers from each of the study sites presented a brief report on the status of the project in their region.