Obstetrical Aspects



Being born small for gestational age (SGA) is classified as being born with a fetal weight or an abdominal circumference below the 10th percentile for gestational age. In the past, a variety of cutoffs have been used, adding some uncertainty to the value of individual definitions of SGA. Of note, the diagnosis of SGA does not allow a distinction between infants who are constitutionally small, growth-restricted and small, or growth-restricted but not small. In general, up to 70 % of infants are considered constitutionally small due to maternal ethnicity, parity, body mass index, and female gender, and thus are not at risk of increased morbidity and mortality; it is important to realize that fetal size is not equivalent to fetal growth. Therefore, a single fetal biometry will not be able to reliably distinguish between SGA and intrauterine growth restriction (IUGR).


Obstet Gynecol Fetal Growth Fetal Growth Restriction Intrauterine Growth Restriction Fetal Weight 
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© Springer Healthcare 2013

Authors and Affiliations

  1. 1.Institute for Pediatric Endocrinology and Preventive MedicineHomburgGermany

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