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I hope this isn’t a stupid place to ask this question.. Is there any evidence of patterns for sibling gender (biological sex at birth)? E.g. likelihood of having a boy after a girl, girl after boy, two of the same, and any further patterns with more than two siblings? Note: I put sibling gender...

I’m curious about the reason behind differences between recommendations around the TDaP vaccine between the US and Canada. (Other countries as well obviously, I’m just speaking about US/Canada as a direct comparison) I’m in Canada and was given a booster at around 28 weeks as per guidelines...