This study elucidates the effectiveness of a menstrual education program with segmented MHM procedure on the MHM skills of girls with intellectual disabilities/HSN compared with those with typical development. Participants in a nonrandomized comparative study included nine adolescent girls with intellectual disabilities/HSN and ten with typical development. They practiced MHM on dolls three times: before, immediately after, and three months after participating in the educational program. Although the total MHM scores were significantly higher after both groups attended the program, the girls with intellectual disabilities/HSN had significantly lower total and mean scores on MHM items than girls with typical development. They still required instruction on the majority of the items after 3 months. Meanwhile, girls with intellectual disabilities/HSN showed a significant improvement in napkin changing skills and maintained post-course scores 3 months later, similar to those with typical development.