By plotting weight vs gestational age, each infant is classified at birth as Small for gestational age: < 10th percentile Appropriate for gestational age: 10th to 90th percentile Large for gestational age: > 90th percentile The Fenton growth charts (see Figure: Fenton growth chart for preterm boys and see Figure: Fenton growth chart for preterm girls) provide a more precise assessment of growth vs gestational age for all three parameters.