Final answer:
Using magnesium sulfate for longer than 5-7 days can lead to various complications in the fetus, including impaired growth, neural development, and increased glucocorticoid exposure. It is important to monitor magnesium levels during pregnancy to ensure the health of the fetus.
Step-by-step explanation:
Using magnesium sulfate for longer than 5-7 days can lead to various complications in the fetus. Magnesium deficiency during pregnancy has been associated with impaired growth, impaired neural development, low birth weight, spontaneous abortion (miscarriage), and stillbirth. It can also contribute to increased glucocorticoid exposure, insulin resistance, dyslipidemia, and impaired glucose tolerance.