The baby will be buckled down and focused :)  No moving and kicking, the
contractions of your uterus will be making things pretty tight int here and
once the baby is engaged in the birth canal there won't be any room for
gymnastics.

No, I wouldn't characterize labor pains as menstrual pains, intense or
otherwise.  It's a very all-encompassing pain that can't really be described.
It's a very deep and intense ache, a mix of sharp and dull at the same time.
Back labor is completely different, I hear, though I never experienced it.

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