Final answer:
The nurse would monitor for feeble limb movements in a newborn with a mother who has myasthenia gravis, as this condition is characterized by muscle weakness due to impaired acetylcholine receptor function at the neuromuscular junction. The Correct Answer is Option. D.
Step-by-step explanation:
The clinical manifestation that a nurse would monitor in a newborn whose mother has myasthenia gravis is D. Feeble limb movements. Myasthenia gravis is an autoimmune disease that affects the acetylcholine receptors at the neuromuscular junction, resulting in progressive muscle weakness and fatigue in those who have it.
This disease can also affect newborns through passive transfer of antibodies from the mother to the baby, a condition known as neonatal myasthenia. While some symptoms such as temperature instability, apnea, or hypotension may be present, feeble limb movements specifically relate to the muscle weakness characteristic of the disorder.