The impact of maternal hyperemesis gravidarum on early childhood respiratory morbidity.

Background: Lung maldevelopment due to in-utero events may potentially cause respiratory morbidity during childhood. Maternal nutritional status during pregnancy is critical for lung development. This study is contributing to the understanding of the interplay between maternal nutrition status during pregnancy, fetal lung development and the risk for respiratory diseases in early life.

Research Question: To investigate the association between maternal hyperemesis gravidarum (HG) during pregnancy and respiratory morbidity in the offspring's early childhood.

Study Design And Methods: This is a retrospective population-based cohort study that included all singleton term deliveries at Soroka University Medical Center (SUMC) between 1991 and 2021. Preterm deliveries (<37 gestational week), perinatal deaths, multiple gestations, and children with congenital malformations or chromosomal abnormalities were excluded. The main outcomes measured were offspring's hospitalizations due to pneumonia, acute bronchiolitis, asthma, or wheezing.

Results: Overall 232,476 deliveries were included in the study, of which 3227 women (1.4%) were diagnosed with HG. Offspring in the HG group exhibited significantly higher rates of respiratory morbidity, including asthma (OR = 1.36, 95% CI 1.22-1.36, p < .001), acute bronchiolitis (OR = 1.38, 95% CI 1.21-1.59, p < .001), and pneumonia (OR = 1.2, 95% CI 1.12-1.48, p < .001). An inverse correlation between multivariate adjusted-hazard ratios for asthma and pneumonia with offspring's age was noted.

Interpretation: This study provides evidence of a potential association between maternal HG during pregnancy and increased risk of respiratory morbidity in offspring's early childhood. Maternal nutritional status during pregnancy plays a crucial role in lung development, affecting respiratory health in childhood.