Prince: Baby cries...

When a baby cries, the baby is putting a hope / expectation on you, and that you have to fulfill their expectation. Once they stop crying the hope is gone, and you will never be able to gain it back again. That is human relationship with their baby, but if it is not properly nurture, the baby will grow up without knowing that, expectation needs action to fulfill, it leads to our current problem in human behavior. During infancy, human certainly can not expect their baby to fulfill their own needs, and that they can only cry to signal you about their needs. As a parent, will have to perform their responsibility to take full care of their needs and expectation, however, when times go on, parent tends to fall into the routine phenomenon of what they do, and they thought this is what they suppose to do, ignoring the fact that it leads to another problem in future.