Considering how Cicero loathed Cleopatra, any disparaging remarks he'd have to make about her (supposedly 3-year-old) toddler son are perfectly consistent. Again, I'm comfortable that Caesarion was born just after Caesar's 9 months in Alexandria, more or less, though if I recall, he actually left Alexandria just before the birth, not after.

I find it far more interesting to watch how Octavian felt about Caesarion. He must have loathed the little bastard with all the hatred of an adopted son for a blood son - well, insofar as Octavian allowed himself to loathe anything for other than political purposes. If I recall, no source is at all clear about the circumstances of Caesarion's murder, except that the instant Octavian could do it, he did. His justification was that he didn't believe the child was Caesar's - but that's pure B.S.

Gillian Bradshaw has written a fascinating book (an "alternative history") in which Caesarion escapes Augustus but goes to ground with an alias identity. Certainly, one can't help but wonder what the boy would have been like - although he would not have, in any way, shape or form, been raised like a Roman, and he would have retained little or no impression of his natural father's world.