Are first babies usually late or early?
Are first babies usually late or early? Distribution of pregnancy lengths for full-term single births. The shaded areas show 90% confidence intervals. First babies are less likely to be “on time” at 39 weeks, and more likely to be a little late, between 41 and 43 weeks. Among full-term pregnancies, first babies are born about 1.3 days later on average.
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