Rumorville:  Carly will eventually come across some paperwork, possibly a birth certificate, listing Dante as the father of Brenda's baby...  However, Alexander was the father of Brenda's baby.

From a different source: Brenda believes her baby died shortly after birth... Sam may be the first person in PC to encounter Brenda's child, although she may be unaware of the child's connection to Brenda.
As always, GOS.