Normal daily fluid requirements for children based on body weight

Under normal physiologic conditions, daily water need is equal to about 100 mL based on daily caloric expenditure of every 100 kcal/kg, which varies with body weight as noted above. This daily water requirement is based on combined daily insensible and sensible water losses. Daily insensible losses from the respiratory tract and skin account for approximately 45 mL per 100 kcal of energy expended. Daily sensible water losses (urine and stool) account for approximately 55 mL per 100 kcal of energy expended.