(Reprinted with permission from Korones SB: High-Risk Newborn Infants: The Basis for Intensive Nursing Care, 4th ed. St. Louis, CV Mosby, 1986.)

The figure below shows the intrauterine growth curves for the 10 th and 90th percentiles, and depicts the different categories of maturity for newborn infants based on birth weight and gestational age. The three babies shown on the previous page were all born at 32 weeks' gestational age, and weighed 600 g (SGA), 1400 g (AGA), and 2750 g (LGA).

Each of these categories has a different mortality rate, highest for preterm SGA and AGA infants, and lowest for term AGA infants.

Preterm AGA infants are more prone to respiratory distress syndrome, apnea, patent ductus arteriosus with left-to-right shunt, and infection. Preterm SGA infants are more likely to experience asphyxia, hypoglycemia, and hypocalcemia.

Intrauterine Growth Curves

Intrauterine Growth Curves

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