Systolic and diastolic blood pressure (BP), heart rate and weight were measured in 260 boys and 254 girls, from birth to 12 months of age. Mean +/- SD values of parameters studied and percentile curves are reported. Systolic and diastolic BP increase significantly during the first 6 months of life and are poorly correlated with weight. In the 1st month of life the diastolic BP values are lower than those reported by others.