Article asserts that anemia in pregnancy is a common condition, especially in low-income countries, but a possible association between maternal anemia and childhood cancer has not been widely studied. In a separate analysis within the years available (births 1995–2014), the authors examined cancer risks among mothers taking prescribed vitamin supplements, using data from the National Prescription Register.

Article describes how only a few studies have reported on the association between hyperemesis gravidarum and the risk of childhood cancer. The authors examined possible associations in this population-based study in Denmark.