Cardiac size of 291 new-born infants was measured using the method illustrated on Fig 1. Among the 291 infants, 53 were asphyxiated, and asphyxia was only regarded from Apgar score below 6 on 1 min. and 5 min. Remaining 238 infants were normal, and classified to group with lung abnormalities and without lung abnormalities on chest A-P film. The results are as follows; 1. The average CTR. of normal group was 52.37.(C/T1;54.89, C/T2;49.43, C/T3;49.15, C/T4;55.97) 2. The average CTR. of asphyxiated group was 54.91 (C/T1;57.13, C/T2;51.69, C/T3;51.94, C/T4;58.25) 3. Consequently, asphyxiated infants revealed larger cardiac size than normal infant group.