| Onset of Nevirapine Prophylactic Therapy | Frequency | Percentage % |
| At Birth | 26 | 32% |
| 0 – 1 Weeks | 16 | 20% |
| 2 - 4 Weeks | 12 | 15% |
| >4 Weeks | 25 | 31% |
| No Response | 2 | 2% |
| Total | 81 | 100% |