Except for right after Snow gives birth to Emma, the curse hits. Absolutely zero time for Snowing to make coffee.
If Emma is a twin, then the second baby would be born moments after Emma. Once the birth canal is open and dilated to the extent that a baby can pass through, it does not take long for a second baby to appear (if there is one) unless there are complications. Hence why the afterbirth comes quickly and very soon post baby.
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"He was a lot of things to me" "The only conclusion was love"