title: Birth weight in twins: an analysis of discordancy and growth retardation.
abstract: Sonographic estimation of fetal weight offers the potential of antenatal diagnosis of discordancy and growth retardation in twins. Although standards for intertwin birth weight percent differences in infants over 2500 g are available, similar norms are not available at lower weights. Intertwin birth weight percent differences in live-born twins above 500 g in 500-g increments were analyzed. Intertwin birth weight differences, expressed as a percentage of the weight of the larger twin, were relatively uniform across a wide range of birth weights. Differences above 15% were increasingly more likely to be associated with growth retardation in one of the infants.
mesh_terms: D001034:Apgar Score; D001724:Birth Weight; D004200:Diseases in Twins; D005314:Embryonic and Fetal Development; D005260:Female; D005323:Fetal Monitoring; D006130:Growth Disorders / Q000453:epidemiology*; D006801:Humans; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age; D011247:Pregnancy; D011272:Pregnancy, Multiple; D014427:Twins; D014463:Ultrasonography