98251229_gWhiz_Catalog_Detail__4
[0] For clinical purposes preterm and postterm infants are defined as: [1] Preterm before 34 weeks if appropriate for gestational age (AGA); before 37 weeks if small for gestational age (SGA). [2] Postterm after 40 weeks if large for gestational age (LGA); beyond 42 weeks if AGA. [3] >>Preterm before 37 weeks, postterm beyond 42 weeks, no matter the size for gestational age at birth. [4] 
Preterm, SGA before 38 to 40 weeks; postterm, LGA beyond 40 to 42 weeks.
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