On average, when born, males tend to be slightly longer and heavier, but females have slightly more mature skeletons.

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Quizplus · Accepted Answer

Research has shown that newborn males tend to be longer and heavier than newborn females, but females have slightly more mature skeletal development at birth. This can be seen in differences in bone lengths and shape, as well as the development of the fontanelles (soft spots) on the skull. However, these differences are relatively small and there is considerable overlap between the sexes in terms of size and development at birth.

On Average, When Born, Males Tend to Be Slightly Longer