Propofol, a commonly used anesthetic, is a fat emulsion, which is milky white. Anesthesiologists sometimes call it "milk". There are 50ml and 20ml specifications, and 20ml is called "little milk".

Small milk anesthesia may only refer to general anesthesia for some short operations, and a "small milk" can be used. For example, painless abortion, painless gastroscopy and so on.