Frankly if the twats had done even what they were doing better, and taken more care, then even in such shit circumstances yes the baby could have survived. Whether she would have, depends on lots of different factors.
Some babies survive in terrible terrible war conditions, including when their care and survival falls to young fleeing sibling survivors, barely able to save their own lives and dragging them poorly protected and underfed through hell and every possible danger as the only thing a terrified fleeing child knows to do with a new born baby. Much of life or death can be luck for some.
CM/MG decided first to make keeping their child luck, then their babies survival luck, (though they deny that) and having made a bunch of shit decisions that gave poor luck far more likely, (ie leave things way late, then buy shit vehicles, don't chuck the placenta to the crows at the 1st opportunity, don't keep vital documents and cash on your body when fleeing, don't have an essentials grab bag, and an easily grabable baby and cat, etc, etc) now claim it was an incidence of pure bad luck that ended her life, that might have happened anywhere any time.
Sadly all the rest of it put together, doesn't prove the last one untrue, especially if you happen to do all the right things to make cause of death harder to ascertain.