How can a mother possibly kill her child?

Today I read a very compelling article called, "Why do moms kill their children?" This article explains why mothers might have the intent and/or desire to do this and this article also answers the question of, "Why do some mothers commit the unthinkable act of maternal filicide?" It says, "Mothers don't kill their children unless they are seriously disturbed," and the article expands on how they are disturbed. It stated, "Psychiatric studies on mothers killing their children and found most had depression, psychosis and suicidal thoughts." After reading this it shows that the mothers need help mentally and that they express their feelings on their children which can lead to negative effects on their children like death and abuse. It states, "She heard voices telling her to throw her children into the water," this further shows the mental illness that woman have and why mothers commit these unthinkable acts might not be because they want to rather because they don't know what is right from wrong. Since she heard voices it was like she had to do it and the voices didn't care about what she would really want to do and this caused her actions to cause death to her children. So the article answers the question of, "Why do some mothers commit the unthinkable act of maternal filicide," by saying that the mothers have a mental illness that they can't control which causes them to the unexpected and unthinkable.