Table 5A.

Content and distribution of body fluids according to age

	Premature	Infant	1 year old	3 years old	9 years old	Adult
Weight (kg)	1.5	3	10	15	30	70
Body surface area (m2)	0.15	0.2	0.5	0.6	1	1.7
Liquid body weight (%)	80	78	65	60	60	60
Extracellular fluid (%)	50	45	25	20	20	20
Intracellular fluid (%)	30	33	40	40	40	40

Note: © 2009 Biomedia. Reproduced with permission from Caramia G, Ruffini E, Salvatori P. Infectious gastroenteritis. Neonatal Infectious Diseases Study Group of the Italian Society of Neonatology. Manual of Neonatal Infectious Diseases. Milan: Biomedia; 2009.⁵⁵