Okay - so you didn't just misread something; you pulled an opinion out of your butt that you hoped was right, but didn't bother to check. Am I right?
None of your sources have anything to do with what you're saying.
Well, I found this and actually read it, so here is the relevant part:
"
Unborn children and assisted reproduction
A child born after a decedent dies can still be included in the estate. The child must be in utero at the time of the decedent's death. In utero means developing in the womb, but not born yet.
The child can also be counted if it was created with assisted reproduction. The child will be included if:
The decedent is the biological parent of the child (the sperm or egg of the decedent was used to create the child),
The child is born within 36 months of the decedent's death,
The decedent consented in writing before death to be a legal parent of any potential child created from their sperm or egg, and
The administrator of the estate receives a written notice with a copy of the decedent's written consent within six months of the decedent's death."
Explains how an estate is divided if a person dies without a will.
www.illinoislegalaid.org
So there are 2 different variants of unborn child in play and not just one. At least for this site.