Time to postpartum family planning initiation and its predictors among mothers coming for first measles vaccination at Family Guidance Association of Ethiopia, Dessie Model Clinic, Northeast Ethiopia: cox-regression model

BACKGROUND: Timing of initiation of family planning is an important determinant for the health status of the mother and her child. One-fourths of mothers in developing countries who wanted to space or limit their children were not using family planning methods at right time after delivery. Despite, the existence of many literatures about postpartum family planning, the timing of it is not yet studied. Thus, this study aimed to assess time to postpartum family planning and its predictors among mothers coming for first measles vaccination in Dessie city, Northeast Ethiopia. METHODS: An institutional-based retrospective follow-up study was conducted among mothers coming for infant vaccination at Family Guidance Association of Ethiopia, Dessie Model Clinic in Dessie City. A systematic sampling technique was used. The data were entered and analyzed using Epi Data version 3.1 and STATA version 14.0, respectively. Kaplan–Meier and Cox regression model were used to test the time and predictors of postpartum family planning initiation. Adjusted hazard ratio with 95% CI was used to test the strength of association at a p-value of 0.05. RESULTS: The rate of postpartum FP initiation was 0.6% with 95% CI (0.0056, 0.0069). Keeping the effect of confounder constant, age of the women 20–24 [AHR = 2.63, 95% CI (1.65,4.19)], 25–29 [AHR = 3.66, 95% CI (2.35,5.73)], 30–34 [AHR = 2.79, 95% CI (1.75,4.46)], getting family planning counseling [AHR = 1.78, 95% CI (1.26, 2.52)], want more child [AHR = 0.47, 95% CI (0.34, 0.66)], having history of abortion [AHR = 0.54, 95% CI (0.36,0.81)] and wanted last pregnancy [AHR = 0.69, 95% CI (0.49, 0.97) were significantly associated with postpartum family planning initiation. CONCLUSIONS: Age, history of abortion, counseling about family planning, the status of last pregnancy and want more child were significantly associated with postpartum family planning use. Continuous emphasis should be given for health care providers to encourage their counseling services for their customers at different age groups with special attention given for elders. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12978-023-01608-w.