RT Journal
T1 AN amplification of young's rule
JF Journal of the American Medical Association
JO Journal of the American Medical Association
YR 1919
FD October 4
VO 73
IS 14
SP 1079
OP 1079
DO 10.1001/jama.1919.02610400057030
UL http://dx.doi.org/10.1001/jama.1919.02610400057030
AB To the Editor: 
    —The inadequacy of Young's rule when it is desirable to determine the dosage of medicines for infants not exactly 1 year or 2 years of age is felt by most physicians. The difficulty is met by each in his own way, usually entailing the memorizing of doses given by some authority for the different ages.I wish to submit a modification or amplification of this rule by which the dosage can be calculated for any age in months with the same degree of accuracy as with years.Take the age of the infant in months and add 144 instead of 12, proceeding as with the old rule. For example, the dosage at five months is thus obtained:5+144=149÷5=30 approximately, or 1/30 of the adult dose.For a baby of 16 months:16+144=160÷16=10 or 1/10 of adult dose.This operates exactly as Young's rule and is, of course,