Emily Oster:

Yes. I think that it's dangerous, like a knife would be.

When I dug into the data, I think that on the one hand, it's — it does show that the safest way to sleep is not with your baby in your bed, that there are some risks to co-sleeping. On the other hand, if you do this and sort of, as safely as possible, which means in a bed with parents who are not smoking or drinking or that has relatively few covers, there probably is some excess risk, but it's — it's small. It's, you know, on the scale of the kinds of risks that you're taking all the time, by putting your kid in a car.