Glad it's helping.... Tessa about the 311 take 120-160 as the general base, so take 120-30 = 90 then 160-130 = 130 so the HR range for an infant is 90-130 (that's the 3 of the 311 formula) then take 90-10 = 80 and 130-10=120 so the HR range for a tod...