There is precedent in Pennsylvania for a lawsuit revolving around a stillborn fetus, as the unborn child's death was said to be caused by a car accident. The case in question was Gullborg v. Rizzo. It established a precedent within the state for how wrongful death cases after car accidents can proceed.
However, other cases have not always followed the precedent. In one case, a doctor was operating on a woman who was pregnant, and the child passed away. The family tried to sue under the same precedent and lost, as the case was said to be different. This shows just how tricky the laws can be when looking at unborn children.