Slide show: Fetal positions before birth
Illustration of twins
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Twins can usually be delivered vaginally if both babies are in the headfirst position. If only the lower twin is in the headfirst position, as shown here, the lower twin can often be delivered vaginally — and the second twin can sometimes be turned or delivered feet or buttocks first. If this can't be done, the second twin might be delivered by C-section. If the lower twin isn't positioned headfirst or neither twin is headfirst, both twins are usually delivered by C-section.

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