Which of the following conditions is NOT typically associated with a deficiency of maternal vitamin D during pregnancy?
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✓ Correct answer: A. Down syndromeAnswer: Down syndrome Maternal vitamin D deficiency during pregnancy can lead to a variety of neonatal conditions related to bone and neurological development. Rickets is a disease characterized by softening and weakening of bones in children, primarily due to inadequate vitamin D. This condition can manifest as skeletal deformities, delayed growth, and in severe cases, hypocalcemia that may lead to seizures. Another condition, neonatal hypocalcemia, is a direct consequence of maternal vitamin D deficiency which results in low calcium levels in newborns, causing symptoms such as poor feeding, irritability, and seizures. Neonatal hyperparathyroidism may also develop as the fetal parathyroid gland attempts to compensate for the low calcium levels, leading to bone demineralization and fractures. Down syndrome, however, is a genetic disorder caused by the presence of an extra chromosome 21 and is not related to vitamin D levels during pregnancy. It results from nondisjunction during cell division rather than nutritional deficiencies.
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