| Methods |
Observational, comparative follow‐up study |
| Participants |
Cases: 236 Chilean women (entering at day 30 postpartum) practicing on‐demand feeding and relying on lactational infertility. Age 23.5, parity 1.7 Controls: 440 urban Chilean women (non‐hormonal IUD within first 2 postpartum months; 125 entering at 30 days; 315 entering at 60 days postpartum) practicing on‐demand feeding using an IUD. Age 23.7, parity 1.8 |
| Interventions |
LAM, education for the cases; cases and controls monthly follow‐up, reinforcement of breastfeeding instructions |
| Outcomes |
CPR 2.45 or 0.45 (788 WMAC) depending on the definition used. 52% of cases experienced menses at 6 months |
| Notes |
Selection bias at point of entry. Controls: 2 different definitions of amenorrhoea used |
| Risk of bias |
| Bias |
Authors' judgement |
Support for judgement |
| Allocation concealment (selection bias) |
Unclear risk |
B ‐ Unclear |
