Getting into pro and con camps
Before, during and after Apgar developed her scoring system, many papers
pro and con appeared.  Evidence appeared to favor the tradition of waiting
for pulsations of the umbilical cord to cease.  The following remarks pertain
to a particularly loathsome article by Taylor et al. (1963), which opened with
the following comment:
"Opinions vary as to the most beneficial time for clamping the
umbilical cord." p893.
To their credit, they then noted the scholarly editorial on the subject in the
June 9, 1962 issue of the Lancet, which introduced the articles in that issue
by Bound (1962) and Secher & Karlberg (1962).  
Taylor et al. then credited themselves with "the minority opinion," as follows:
"The minority opinion cautions that this rapid and relatively large
transfusion might overload the infant's circulation."  p893.
They introduced their own investigation as being directed to the effects of
early or late clamping of the cord on the clinical condition of the newborn,
and expressed concerns over observations of temporary venous
hypertension in infants following delayed clamping.  They then described
their experimental protocol:
"The original plan was to study only infants born of ward mothers.  
Ward patients were assigned in rotations to Service I or II when
first seen at the hospital.  Service I infants were to have early and
Service II late clamping of the umbilical cord." pp893-894
This plan was carried out for full-term infants, but --
"It became necessary to include private patients in the premature
group to increase enrollment; the planned randomization of these
infants as to time of cord clamping failed," p894.
What an outrageous statement.  Consent was apparently not easily obtained
from private patients to be randomly assigned to one group or another.  Only
clinic patients, those without means to pay for private care.
Childbirth was not covered by medical insurance in 1963.  That was the year
my son was born, and I was a "ward patient" because my husband was a
graduate student.  I agreed to be a participant in the "Collaborative Perinatal
Study," which I understood was to follow children frequently during
development.  My son needed to be resuscitated at birth, which was very
worrisome and unsettling despite all the chiding that he was doing just fine.
Three years later he was diagnosed with autism, because of developmental
language problems -- which fit Kanner's description of "irrelevant and
metaphorical" use of phrase fragments.  
I have no idea what "randomized" treatment group we were assigned to.  As
for long-term developmental follow-up, that was left for me to deal with, as
described at
http://www.conradsimon.org/
Randomized-controlled studies should be reserved for experimentation with
animals only, no matter how much the animal-rights advocates object.  "Ward
patients" should have more rights than animals.