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Changes in the total body water, extracellular fluid and intracellular fluid constitution of body weight with age.
| Age | Total body water (%) | Extracellular fluid (%) | Intracellular fluid (%) |
|---|---|---|---|
| Fetus (<3 months) | 90 | 65 | 25 |
| Neonate (Premature) | 85 | 50 | 35 |
| Neonate (Full-term) | 75 | 40 | 35 |
| Infant (4–6 months) | 60 | 23 | 37 |
| Adolescent | 60 | 20 | 40 |
| Adult | 60 | 20 | 40 |
