Children who have an autism spectrum disorder (ASD) diagnosis, because of their differences, need different approach and many adjustments in everyday surroundings, especially in the educational institutions. Creating adjustments for children with ASD, as much as their challenging behaviour, represent big challenge for their kindergarten educators. Some existing research looked into the attitudes of grown-ups, educators and students towards a child or a person with ASD and most of them conclude that those attitudes are more positive if the people in the research knew about the fact that the person has ASD. The aim of the research was to examine how kindergarten educators perceive different behaviours of children with ASD (the behavioural descriptions contained A (communicational characteristics) and B criteria (repetitive behaviours), as well as neutral behaviours) when they were informed that the child has ASD and they weren’t informed about that. In total 83 educators participated (47 of them made up the experimental group which was given the information that the child has ASD and 36 of them made up the control group which were given no such information). Kindergarten educators from the experimental group rated these situations more positively than the control group: the boy with ASD does not want to play with other children, the boy with ASD laughed at another boy getting injured and finally when the boy with ASD had a negative reaction to music causing it to be turned off. The situation where the boy with ASD insists on having a specific order with toys, along with situations with neutral behaviours (getting ready by himself to go to a playground, washing his hands before eating and going to the dining room) both groups rated equally positively. Knowing that the child has an ASD diagnosis does not cause the perception of neutral behaviours to be more positive. Most experimental group kindergarten educators conclude that knowing a child has ASD helped them understand the cause of the child’s challenging behaviours.