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