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I havent heard of this one before o

And this is true.

According to some traditions, a pregnant wwoman means TWO persons and we can't bury two in one grave

So they take out the baby and bury it in another grave If the baby died.?

Exactly.
You know how village cemetery is? They bury on a very shallow grave.

Wait, I want to to elaborate but this is night and I don't want my baby to get scared