Newborn animals know that when mommy is away, they need to be very, very quiet–it’s a matter of life or death. Fawns sink as low to the ground as they can, lying motionless, trying to avoid detection. Baby birds huddle together quietly, saving their noisemaking until momma comes home. Even lion cubs know that being quiet and undetectable is a life-saving issue.
So–why is it human newborns (let’s say 0-3mos) cry so much? In more primitive times, wouldn’t that signal every predator in town to come get an easy meal? Unlike the fawn or the cubs (or really, all other infant animals), a human baby can’t effectively run from danger for years…we’re pretty helpless for the first several months.
Why draw attention to that fact?? Wouldn’t it make sense, Darwinian-wise, that noisy babies would get culled from the gene pool? How did this mega-WAH! factor become a successful genetic attribute?