Final answer:
Intrauterine growth restriction is defined by being two deviations below the expected gestational age mean, affecting fetal growth and potentially causing long-term developmental delays.
Explanation:
Early-onset intrauterine growth restriction is defined as two deviations below the mean for the expected gestational age. This restriction can be caused by maternal, fetal, or placental factors affecting the normal growth of a fetus.
Low birth weight, often associated with intrauterine growth restriction, increases the risk of infant mortality and long-term developmental delays in children surviving infancy.
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