Which maternal factor is most likely to contribute to preterm delivery?

The presence of chronic health conditions is a significant maternal factor that can contribute to preterm delivery. Chronic health issues such as diabetes, hypertension, and autoimmune disorders can complicate pregnancy and increase the risk of early labor. These conditions may lead to physiological stress on the mother and fetus, influencing the timing of delivery. For instance, uncontrolled diabetes can cause increased fetal growth, which may lead to complications requiring preterm delivery, while hypertension can cause placental issues that may necessitate early intervention.

In contrast, a healthy balanced diet, participation in prenatal classes, and good access to healthcare are generally supportive factors that promote maternal and fetal health. A balanced diet contributes to proper fetal development and maternal wellness, prenatal classes provide education and preparation for labor, delivery, and postpartum care, and access to healthcare ensures regular monitoring and management of any potential complications during pregnancy. Therefore, while these factors are beneficial, they do not contribute to an increased risk of preterm delivery.