I don't know. But it seems really plausible. If your infant dies two days after being injected with something, there is a solid temporal argument to be made that maybe the injection caused the death. But a lot of people will tell you that you can't question vaccines roles in SIDS. But this is not the case. You can question anything you want to. And if somebody tells you not to question it, fuck them. Anybody who asks you not to think doesn't have your best interests at heart.