«The Metzitzah controversy is nothing new.Metzitzah and the Halachic Process | Cross-Currents
In the 1800's, in Germany, the elements of Reform sought to ban circumcision entirely, attacking the "barbaric" practice of Metzitzah b'peh (MBP), where a Mohel would suck the blood away from the circumcision site.
A little earlier history is in order. The Talmud requires that after a Bris is performed, the blood must be suctioned away from the wound. The reason given is for the safety of the baby. Presumably, the purpose of Metzitzah is to cleanse the wound area of any germs and prevent infection.»