Inventor, I would have to disagree. Men kill their own children as well. Look at John List or Brad Bishop. John List shot his three children (as well as his wife and mother) one at a time, as they came home from school or practice. He slept the night in the same house - with his family wrapped in sleeping bags downstairs - and even ate breakfast there before leaving. Brad Bishop bludgeoned his family - also three children, wife, and mother - to death one night. The three boys were sleeping. He also wrapped them, then took them to the car, then buried them in a forest. Both of these men were very capable of murdering their own children.
Women are more known for murdering their children because they rarely murder outside the family. That's not to say that they never do - there are cases, of course - but they are far less likely to strike outside the home. Men are more likely to externalize their anger, and kill strangers, friends, or others outside their family and are better known for it. However, they do kill their own children.
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"Nothing worth having is easy."
Three years!