primiparity, grand multiparity., lack of prenatal care, low socioeconomic status, nutrional needs before third trimester o Maternal disease: heart disease, substance abuse, sickle cell anemia, PKU, lupus, asymptomatic pyelonephritis with SGA, preeclampsia decreases O2 to fetus o Environmental factors: high altitudes, exposture to xrays, excessive exercise, hyperthermia, nicotine, alcohol, narcotics o Placental factors: small, infracted areas abnormal cord insertions, placenta…
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