OBJECTIVES: To determine the prevalence of postpartum contraception use among teenage mothers and to identify the factors influencing both postpartum contraception use and loss to postpartum follow-up at the Faculty of Medicine Vajira Hospital in Thailand.METHODS: Four hundred and seventy-five participants were randomly selected from 1,060 Thai teenage pregnant that gave birth at the Faculty of Medicine Vajira Hospital between 1 January 2017 and 31 December 2020 and were scheduled postpartum visits. The clinical factors associated with postpartum contraception use and loss to postpartum follow-up were studied using multiple logistic regression analysis.RESULTS: A total of 451 participants remained after excluding criteria. Of these, 212 participants did not follow-up on their postpartum visits, leaving the limitation to summarize the true prevalence of postpartum contraception use of the total population. However, of the 232 participants who visited postpartum follow-ups, the prevalence of contraceptive use was 95.8%. Married status was the only factor associated with higher postpartum contraceptive use (odds ratio (OR) 12.81 [3.38-48.64]). Age 18 years and older (ORadj1.71 [1.16-2.53]), absence of previous contraceptive use (ORadj1.91 [1.29-2.80]), and total antenatal care visits fewer than 8 (ORadj 1.61 [1.07-2.42]) were significantly related with loss to postpartum follow-ups.CONCLUSION: The prevalence of contraceptive use was high among teenage mothers who had follow-up postpartum visits. However, this population also had a high loss rate of postpartum visits. Interventions and close monitoring should be considered to evaluated further for effective adolescent reproductive services.