RELATIVE BIRTHWEIGHTS OF TWINS

  • 1 January 1977
    • journal article
    • research article
    • Vol. 49  (6) , 717-720
Abstract
In a series of 182 human twin gestations 2nd-born twins were made often heavier than 1st-born twins (55%), but overall they weighed less by an average of 21 g. This paradox apparently was due to skewed distribution of weight differences favoring the 1st-born twin, most apparent among pairs in which 1 or both weighed at least 3000 g. The larger the difference between birthweights, the greter the likelihood that the heavier twin would be delivered 1st.

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