Mothers that bury their babies: Kelly Silk

The horror of Kelly Silk's rampage in East Hartford sparked an immediate quest for answers: What could drive a woman to turn on her own child and husband?

One of the possible answers offered has been that Silk suffered from some form of postpartum depression. The condition, more severe than the so-called baby blues, affects as many as one in every 10 new mothers and generally is not associated with violence.

A far more rare and extreme form known as postpartum psychosis can, however, spark more dangerous behavior.