Yes, indeed, certain . . . enhancements . . . were needed.
The development of the large brain was not a simple accident. Studies at the University of Chicago have shown it was a complex event that occurred over a relatively short period of time. It not only required changes in size of the brain but significant changes in reproductive capabilities to accomodate larger brain size.
Yep. That's why most species are born with the ability to survive alone, or at least to be able to function independently within a year of birth. For humans, the gestation lasts for a few years after birth, because no woman would survive giving birth to a child with a fully developed brain.
Yes, indeed, certain . . . enhancements . . . were needed.