Children who are exceptional learners typically have difficulties studying as they have developmental barriers, so they need extra stimulation to improve their ability to learn. The clinic program and parents must be involved to stimulate their children with special needs. Besides, parents needed the proper knowledge and skills to help their children after the clinic program. Hence, parents need a child stimulation handbook to continue the stimulation program at home. Buku Stimulasi Anak was developed as a guide for parents to stimulate their children. This research aims to test the child stimulation handbook to improve parenting self-efficacy. By the quasi-experiment method with pre-test post-test one group design, there are 14 parents as participants, and the Self-efficacy Parenting Task Index-Toddler Scale (SEPTI-TS) as an instrument measurement. The result from the t-test analysis shows that there are differences between pre and post-test averages (sig 0,00<0,05). This means Buku Stimulasi Anak can improve parents' parenting self-efficacy as they stimulate their children at home.