The 1950 edition of William's Obstetrics
provides the following comment:
"Clamping or ligating the umbilical cord should be
deferred until its pulsations wane or, at least, for one
or two minutes."
"There has been a tendency of late, for a number of
reasons, to ignore this precept.  In the first place the
widespread use of analgesic drugs in labor has
resulted in a number of infants whose respiratory
efforts are sluggish at birth and whom the obstetrician
wishes to turn over immediately to an assistant for
aspiration of mucus, and if necessary, resuscitation.  
This readily leads to the habit of clamping all cords
promptly."
Eastman HJ (1950) Williams Obstetrics, Tenth Edition, pp 397-398
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Notes