Chimpanzee mothers have a labor of about 40 minutes, while first-time human mothers can have a labor of 12 to 16 hours. Human pregnancies are longer than expected for our size, determined by a metabolic threshold rather than the size of the baby's head. There's a biological and economic similarity in when humans go into labor, as it becomes too costly for the mother's body to continue the pregnancy, leading to childbirth typically at full term to avoid risking the lives of mother and offspring.

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