That's a pretty hardcore reproductive instinct there. Do they do it if their food and other resources are tight, or all the time?

What percentage of human moms would kill 2 other babies to guarantee their baby would never be poor?

My guess: 60%

I mean, wealthy people are doing this all over the world as we speak...

> "Three crucial factors that influenced how likely a female was to commit infanticide were: Living in a harsh environment, Motherhood that involved particularly high energy costs for the female, High competition for resources with other individuals. When such pressures reach a threshold, mums seem primed to kill. Hrdy is impressed with the work, though she questions why humans were not included. Hrdy has also studied infanticide in humans and points out that, in our society, mothers rely on particularly high levels of social support during the early stages of their child’s life. If that support isn’t there, human mothers may be more likely to neglect their children, even to the point of death."

Kids growing up in foster care because their psycho mom killed two babies.

Not a great start to life

So, stress-induced infanticide, makes sense.

Therefore decreasing the number of potential mates for her baby as well

Future competing females and males of the babies too, hadn't thought of this angle, wonder if they go after one gender more than the other

I guess better than when their daughters are competing for a spot on the marmoset cheerleading team.

They do the reverse, they force birth so their competition is less likely to succeed.