I Agree with BG, could be a mental issue.
In a similar incident from 2009 a woman from Taxes shocked the entire world when she brutally murdered, dismembered and ate her newborn child.
She was later said to have been suffering from some weird of Post-Partum Psychosis backlash or something.
Read more at http://www.inquisitr.com/30950/horrific-mother-kills-eats-baby-in-texas/...