And, of course, the reason why Crying It Out can be so damaging to the 
very young baby, is that the extreme physical distress can re-open that 
valve as the baby re-establishes foetal bloodflow patterns...

Morgan Gallagher

 Sam Doak wrote:
> After birth, the increase in blood perfuses the heart, the lungs, kidneys,
> liver, all the ignored fetal organs. If the blood volume does not increase,
> the foramen ovale may remain open, creating the "hole in the heart" which
> impedes normal circulation. If the blood volume does not increase, the
> ductus arteriosis (shunt from the pulmonary artery to the aorta, bypassing
> the fetal lungs) may not clamp down, leading to poor lung function; excess
> red blood cells do not break down to give the liver additional stores of
> iron, possibly causing a lifelong anemia. 
>
>   

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