Poor Kid!
There are different hypotheses concerning the second reason. One ultimate cause
of crying could be the empathy that is provoked in
someone who sees another human crying. The humans who cry most often and are
most associated with crying are babies When
a baby cries, they receive attention from someone who takes on a parental role.
So it's probable that humans later in life cry to initiate a parental response
in someone else. If you're injured (emotionally or physically), you need someone
to help you.