Importance There are limited high-quality, population-level data about the effect of SARS-
CoV-2 infection on pregnancy using contemporaneous comparator cohorts. Objectives To …

Importance There is limited comparative epidemiological evidence on outcomes associated
with COVID-19 vaccination during pregnancy; monitoring pregnancy outcomes in large …

Objective To study the effect of increasing endometrial thickness on live birth rates in fresh
and frozen-thaw embryo transfer (FET) cycles. Design Retrospective cohort study. Setting …

Objective To assess the risk of preterm birth, small for gestational age at birth, and stillbirth
after covid-19 vaccination during pregnancy. Design Population based retrospective cohort …

Background This study aimed to examine the relationships between various maternal
socioeconomic status (SES) indicators and the risk of congenital heart disease (CHD) …

Ontario Midwifery Program and the Niday Perinatal Database. These programmes worked
together to normalize their data and build a robust, web-based data-collection and reporting …

Importance A recent epidemic of opioid abuse has been described in many communities,
although population-based data on trends in use in pregnancy and perinatal outcomes after …

Aims/hypothesis The aim of this study was to examine how BMI influences the association
between Asian ethnicity and risk of gestational diabetes (GDM). Methods This population …

Maternal and neonatal trauma during forceps and vacuum delivery must not be overlooked
Page 1 Maternal and neonatal trauma during forceps and vacuum delivery must not be …

Importance The long-term cardiometabolic consequences of late preterm birth (34-36 weeks'
gestation) are not well understood. Objective To assess whether late preterm birth and size …