Percentage of total body water to body
weight at birth?
a) 90%
b) 80%
c) 60%
d) 50%
Correct Answer - B
Ans. B. 80%
[Ref Principles of medical physiology p.712]
The major component of body mass is water.
The contribution of water to body weight varies with age.
Total body water (TBW) as a percentage of body weight declines
form as high as 90% in early fetal life to 75-80% at birth.
Thereafter it delines progressively to 60% by the end of one year.
After that it remains constant.