A baby's existence for the first three months is a one-way street. One person is doing all the work and the other is crying, sleeping and pooping. So the first moment when you're actually able to do something and they acknowledge your presence, that's a big deal. A very big deal.
“Freud's view is that all love is sexual in its origin or its basis. Even those loves which do not appear to be sexual or erotic have a sexual root or core. They are all sublimations of the sexual instinct.”