I haven't done much digging on this but apparently in NY:
" Homicide means conduct which causes the death of a person or an unborn child with which a female has been pregnant for more than twenty-four weeks under circumstances constituting murder, manslaughter in the first degree, manslaughter in the second degree, criminally negligent homicide, abortion in the first degree or self-abortion in the first degree."
https://www.nysenate.gov/legislation/laws/PEN/125.00
But, there is a conflicting statute:
1. "Person," when referring to the victim of a homicide, means a human being who has been born and is alive.
https://www.nysenate.gov/legislation/laws/PEN/125.05
In regards to homicide of an unborn child, here is a full list of how states handle it:
https://www.nrlc.org/federal/unbornvictims/statehomicidelaws092302/
"38 states that recognize the unlawful killing of an unborn child as homicide in at least some circumstances"