Characteristic of Infantile Body Fluid Balance A. Total body water its distribution Body water compartments related to age(total body mass % ECF ge TBW ICF Plasma ISF Newborn Intant 78 37 35 I year 70 25 40 2-14 years 66 6555 20 40 Adult 55~66 10~1540~45 TBW: total body water ECF extracellular fluid ICF intracellular fluid ISF: interstitial fluidCharacteristic of Infantile Body Fluid Balance A. Total body water & its distribution Body water compartments related to age (total body mass%) Age TBW ECF ICF Plasma ISF Newborn infant 78 6 37 35 1 year 70 5 25 40 2～14 years 66 5 20 40 Adult 55～66 5 10～15 40～45 TBW: total body water ECF: extracellular fluid ICF: intracellular fluid ISF: interestitial fluid