These things happen everyday.What I don't understand is how the parents can do such things to their own children.
A similar case happened in UK where a mom along with her boyfriend used to lock their 4yr old in a closet after hitting her.They killed her by drowning her making it look like an accident and when the child's body was examined it was found that the there were multiple fractures on her body and the closet where she was locked time and again had her bloody fingerprints.
Even today I cannot forget the little girl's face.