Newborns = 100-160 beats/minute 0-5 months = 90-150 beats/minute 6-12 months = 80-140 beats/minute 1-3 years = 80-130 beats/minute 3-5 years = 80-120 beats/minute 6-10 years = 70-100 beats/minute 11-14 years = 60-105 beats/minute 15+ years = 60-100 beats/minute