STMs when did your first baby arrive?

Sousou
Hey ladies :) I have a quick question for second time mothers. When did your first baby decide to make their arrival? My in laws have travel plans that make it so that they may miss the birth of the baby by a couple of days. My MIL really wants to make it for the actual birth and she said that first time mothers usually always give birth later than their due date. Have you guys heard of this? Just curious :) 

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