title: Birth weight for gestational age among Flemish twin population.
abstract: OBJECTIVE
  The aim of this study was to develop birth weight references for twins. Mean birth weights of individual twins are lower than those of singletons, hence singleton birth weight curves may not be suitable to assess twin birth weights.
  
  
  METHODS
  Twin birth weight curves were developed according to gestational age, gender, parity and mode of -conception. The curves are based on population-based data of 40,494 twins born in Flanders, Belgium between 1987 and 2007.
  
  
  RESULTS
  A different growth potential was found comparing the birth weights of twins and singletons. Twins deviate from the singleton curve from 30 weeks gestational age on.
  
  
  CONCLUSIONS
  Our study underlines that singleton birth weight curves differ from twin birth weight curves. We developed specific twin birth weight curves can be used in clinical practice in order to follow growth patterns of twins in utero.
authors.affiliation: AZ Maria Middelares Ghent, 9000 Gent, Belgium.
authors.forename: E C G
authors.initials: EC
authors.lastname: Doom
authors.affiliation: Department of Obstetrics & Gynaecology, University Hospital Ghent, 9000 Gent, Belgium.
authors.forename: I
authors.initials: I
authors.lastname: Delbaere
authors.affiliation: Study Center for Perinatal Epidemiology, 1060 Brussel, Belgium.
authors.forename: G
authors.initials: G
authors.lastname: Martens
authors.affiliation: Department of Obstetrics & Gynaecology, University Hospital Ghent, 9000 Gent, Belgium.
authors.forename: M
authors.initials: M
authors.lastname: Temmerman
keywords: Standards; birth weight curves; twin birth weight; twin specific birth weight curves
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