Past studies in autism have shown that individuals with Autism Spectrum Disorder (ASD) exhibit impairments in their toileting skills due to their cognitive skills. Hence, a 10-month intervention programme was developed to help ASD children aged 3 to 5 years old to master toileting skills. This multiple baseline design study sets out to examine the effectiveness of a parental intervention. Moreover, a visual prompt approach was used in the intervention and it helps to enhance the child's processing ability. Quantitative data collection (frequency recording forms) were used to record the number of occurrences on the targeted behaviours on their toileting skills which then converted to percentage correct to find out the mastery criterion level of the children. The findings showed that five children with ASD had successfully satisfied (80% above) most of the performance criteria on the toileting skills that had been taught to them by their parents. In contrast, the whole performance criteria on the toileting skills were only mastered well by one of the subjects. This finding has proven that early intervention on toileting skills based on parents and learning tools (busy bags) may help motivate learning among children with ASD.