The age incidence of infantile tetany or spasmophilia is often stated as from about 6 months to 2 years. Recent reports have shown that it can occur in the first few months of life, and several instances have been recorded in new-born infants.1 In the diagnosis of some of these, much significance has been given to Chvostek's facialis phenomenon.
It is well known that the facialis sign may occur in older children who have no spasmophilic symptoms and whose blood calcium and electrical reactions are within normal limits. It should be emphasized that this is true also in the early weeks of life. In fifty-five apparently normal new-born infants, we2 found that the facialis sign could consistently be obtained. In one of these infants the blood calcium was 7.3 mg. per hundred cubic centimeters; in 4 it was between 8 and 10 mg., and in the remainder between
Mitchell AG, Stevenson FE. CHVOSTEK'S FACIALIS SIGN IN NEW-BORN INFANTS. JAMA. 1932;99(18):1502. doi:10.1001/jama.1932.27410700005010c