3. By gestational age and birth weight Small for gestational age(SGA)小于胎龄儿 Bw<the 1oth percentiles Appropriate for gestational age(AGA)适于胎龄儿 the 10th percentiles <bw< the 90th percentiles Large for gestational age(LGA)大于胎龄儿 Bw>the 90th percentiles3.By gestational age and birth weight Small for gestational age (SGA) 小于胎龄儿 BW < the 10th percentiles Appropriate for gestational age (AGA) 适于胎龄儿 the 10th percentiles <BW< the 90th percentiles Large for gestational age (LGA) 大于胎龄儿 BW > the 90th percentiles