Has Anyone Come Across Any Evidence of Pre-Muhmamamd Mass Graves of Female Babies?

[Mister Agenda]

Killing off your female children doesn't seem like a winning reproductive strategy. You'll have more males in the long run if you have more women who can give birth to them. Maybe the plan was to kidnap and rape the women of other tribe's to secure the next generation; but I'm not sure how good an idea it is to have most of the women in your camp be kidnap and rape victims. I'd need more evidence to believe this was rampant practice.