A nurse is assessing a newborn whose mother had gestational diabetes mellitus. The nurse should monitor for which of the following findings as a manifestation of hypoglycemia?

The correct answer is D: Jitteriness. Neonates born to mothers with gestational diabetes are at risk for hypoglycemia due to the abrupt cessation of the maternal glucose supply postnatally. Jitteriness is a common manifestation of hypoglycemia in newborns. It is important for the nurse to monitor for this sign as it indicates the need for prompt intervention to prevent further complications. Abdominal distention, petechiae, and increased muscle tone are not typically associated with hypoglycemia in newborns born to mothers with gestational diabetes.