Which of the following complications is NOT commonly associated with diabetes in pregnancy?

In the context of diabetes in pregnancy, the typical effects of maternal hyperglycemia on fetal development and growth are well-documented. Macrosomia, which refers to an excessively large fetus, is frequently seen in pregnant women with diabetes. The high levels of glucose lead to increased insulin secretion from the fetus, promoting excessive growth.

Increased birth defects are also a significant concern. Research shows that women with poorly controlled diabetes during early pregnancy have a higher risk of their babies developing congenital anomalies due to the teratogenic effects of hyperglycemia.

Complications during labor can arise due to various factors, including the size of the baby (as macrosomia can complicate delivery) and other factors related to the mother's condition, such as preeclampsia or fetal distress.

In contrast, improved fetal growth does not align with the physiological effects of diabetes during pregnancy. Typically, the presence of diabetes leads to growth complications rather than an enhancement of fetal growth, which can result in healthy outcomes. Hence, stating that improved fetal growth is associated with diabetes during pregnancy is misleading, making this choice the correct answer.