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.