For Clinical Purposes,preterm and Postterm Infants Are Defined As

For clinical purposes,preterm and postterm infants are defined as:

A) Preterm: Before 34 weeks if AGA;before 37 weeks if SGA
B) Postterm: After 40 weeks if LGA;beyond 42 weeks if AGA
C) Preterm: Before 37 weeks,postterm beyond 42 weeks;no matter the size for gestational age at birth
D) Preterm: SGA before 38 to 40 weeks;postterm,LGA beyond 40 to 42 weeks