In all fairness, the baby could have fallen all by himself. Kids that little often try to climb out of their high chairs, cribs, and car seats. When Brittany drove with the baby on her lap that was wrong, and she deserved the black mark on her, but that does not mean she's a bad mother. That said, I will admit that she's young, stupid and has bad taste in men.
She still should have taken the child into a hospital before 6 days passed!
One theory is that the Lindberg baby was killed by an insane relative, who almost did him in earlier. She was never to be left alone with him, but she was. There are many holes in that case, ruined evidence, strange stuff.