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@katrina2017 If it makes you feel better, the risk to unvaccinated children is already so low that the difference between the two vaccines is utterly clinically insignificant. Some countries don't recommend covid vaccines at all for young children.

@cqw It's not twice as likely because there are also two different ways to get same sex siblings. Just look at the coin flip scenario in your comment. There are four possible outcomes, each having equal probability. Two result in a mixture and two do not. Therefore you are just as likely to get...