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Complement components in infants, and comparison with adults
| Components | Infants (% of adults) | Time to reach adults levels | References |
|---|---|---|---|
| C1q | 65% | 1 year | 44 |
| C2 | 95% | 6 months | 44 |
| C3 | 70% | 1 year | 44 |
| C4 | 73% | 6 months | 44 |
| C5 | 65% | 6 months | 44 |
| C6 | 65% | 6 months | 44 |
| C7 | Same level as adults | 43 | |
| C8 | Low | 6 months | 43 |
| C9 | 10–30% | 1 year | 43 |
| Factor B | 70% | 6 months | 44 |
| Properdin | 25% | 1 year | 46,47 |
