Research Article

Changes in distribution of gestational age and birth weight among firstborn infants of Cardiff residents.

Br Med J 1977; 2 doi: (Published 08 October 1977) Cite this as: Br Med J 1977;2:925
  1. R Newcombe,
  2. I Chalmers


    We studied data on firstborn singleton infants born to primiparous Cardiff residents during the decade 1965-1974. Both mean birth weight and gestational age at delivery fell appreciably during 1965-74. Changes in maternal age, height, smoking habits, or history of abortion did not explain these findings. The increased proportion of infants weighing less than 2500 g may be explained by the overall reduction in gestational age at delivery, which, in turn, may have resulted from increased use of elective delivery during the second quinquennium.