Are car seats ineffective after two?

One of those viral tweets fluttered across my page about a week ago and I can’t stop thinking about it. It basically claimed car seats are no better than a normal seat belt after 2.They linked to this episode of freakanomics.https://ift.tt/cUbXlpE read the transcript but not the studies as I have a newborn and my brain can’t handle that. Is the claim that car seats don’t matter after 2 untrue? How does that stack up to all the claims that your kid should be rear facing as long as possible?I wish there were a flair that didn’t require links. via /r/ScienceBasedParenting https://ift.tt/ycsnefW