The third one is a legal issue already in many cases, as well. Most commonly it's seen in charges against crack mamas, but I believe there are some laws on the books about alcohol poisoning too.
But none of those 3 is "murder" by any conception, there's no intent to kill even if the fetus were a person. Alcohol-related vehicular homicide sometimes gets treated like murder, but this is bad law. Attempts to criminalize the incidental termination of a pregnancy in the course of an assault on the mother as "murder" would also be bad law, and are specifically being pursued as a "wedge".
Good law respects the traditional definition of murder as intentional homicide of a living breathing person and does not try to fudge this concept in the course of criminalizing other acts.
And that woman who falls down the stairs, wtf? Is that just there for contrast?