Hard to get past

The "sinful infant" subject makes me think and ponder- not by any means unable to move forward, but it's hard to get past blindly. I'm not necessarily in agreement or disagreement on this subject, it simply strikes an odd chord with me. It brings up numerous questions and points. I'll ask questions lastly, making a few argument-like points first.

I can see where he gets the idea that infants are sinful, self-centered in fact. Self-centered-ness is definitely a form of arrogance, the root of all sin. A child thinks nothing of any other. The child only sees others as a source of fulfillment of their many desires and needs. A child will scream, cry, kick, bite, hit, or hold it's breath until it gets what it wants. It is in fact greedy with this, as well. Suckling the mother's breast, far past it's tummy's extent- often vomiting up the excess, wasting it- simply because it enjoys it. It is jealous, as Augustine pointed out, pushing its sibling away from the fountain of nourishment, or being otherwise violent and fussy. It expects all it sees to fulfill whatever need or desire comes to its fancy, regardless of relationship.
However, a baby is not conscious of these things. It is simply following instinct. It is better to be stuffed than possibly starve. The child knows nothing of itself, it is not conscious of others either. It is not capable of analyzing relationships or desires, neither will it then think that it doesn't care who cares for it, as long as it is cared for. It is not conscious of these things at all. It is driven by instinct- it also learns through conditioning what works and what does not work in order to be nourished. It does not ponder how, it is simply taught-- in a similar fashion as muscle memory works. One does not think about why one holds a pen a certain- it simply happens. You may be thinking about it now, or have thought about it before, but it was learned by thoughtless doing.
...Yet, I cannot imagine why an infant would push away another child.

So question:
Is the infant really not conscious of everything: others, self, its own actions?
At what point/age does it become conscious of others?
Of self?
If the infant is not conscious of self, does this mean an infant does not have a soul?
Is the soul asleep; and if so does it wake up as it becomes conscious?
When does a child begin to sin?
What happens to an infant when it dies?
Can one consider an infant's instinct selfish?
Is the selfish really more natural than selfless?

@_@