Why do some women hate their children enough to hurt them?

I know this is a very sensitive topic, and don’t mean to offend anyone with this question because it is so sensitive, but there has been this viral video out of a Malaysian woman beating her child and it made me wonder this. Given, of course, that it is not only women who can abuse their offspring (men as well), but I’m just wondering what it could be? That seems prevalent for a small amount of mother’s to hurt their children. Could it come from postpartum depression? Or some type of angst the women had before they got pregnant? I also remember another video that got out years ago with a woman named Madelyne Gorman Toogood who was caught on camera beating her daughter. Or the Caylee Anthony case. And other things like women murdering their children, or drowning their children,etc. Why their own kids? Is it some deeper psychological thing?

I’m in no way implying that only women are known for this, and I know it’s hard to talk about, just wondering.