Liberals today object to circumcision. They call it barbaric.
Circumcision at 8 days is not barbaric.
Jehovah did not explain. However, in recent years man has learned some of the physical reasons
why the eighth day was a good time to circumcise. Normal amounts of the
blood-clotting element called vitamin K are not found in the blood until the fifth to the seventh
day after birth. Another clotting factor known as prothrombin is
present in amounts only about 30 percent of normal on the third day but
on the eighth day is higher than at any other time in the child’s
life—as much as 110 percent of normal. So, following Jehovah’s
instructions would help to avoid the danger of hemorrhage. As
Dr. S. I. McMillen observes: “From a consideration of vitamin K and
prothrombin determinations the perfect day to perform a circumcision is
the eighth day . . . [the] day picked by the Creator of vitamin K.”—None of These Diseases, 1986, p. 21.