Procedures
Perinatal data including clinical symptoms (collected at admission), laboratory findings (blood specimens were collected at admission), chest CT images (with good protection of lead clothing), treatment (including drugs, intensive care and mechanical ventilation), maternal complications and pregnancy outcomes were collected from electronic medical records. The neonates’ information including gestational age, birth weight, Apgar score, laboratory findings and adverse events were analyzed. Data were independently checked for accuracy by two investigators (P. Tian and Z. Huang). Clearance of viral RNA was defined as two consecutive negative nucleic acid tests on respiratory tract specimens, taken at least 24 hours apart. Classification for mild, moderate, severe and critical COVID-19 was based on the Chinese guideline for COVID-19 management (version 5.0)13.