The interest in this topic to the Christian apologist concerns the earliest advent of human care and concern as well as the advent of pain in child birth. Females helping other females birth their offspring, is a human type of care that is only rarely seen in other primates whereas, until the advent of modern times with the appearance of male obstetricians, it was nearly a universal human trait. The pain in child birth is caused by two conflicting evolutionary needs. Bipedalism requires that the legs be close enough together so that the person can walk without a waddle. But this causes the pelvic opening to be small.
Intelligence requires large brains and thus large cranial sizes.
These two conflicting features lead to the tight fit of the infant through the birth canal. Trevathan's thesis is that problems relating to human deliveries produced selective pressures which led to the nearly universal human practice of midwifery. This is not to say that midwifery is an absolute necessity. Women have for millennia delivered babies all by themselves with absolutely no assistance. The increase in mortality is what drove humans to use midwives in all cultures.