Editing Developmental disorder (section)

===== Repetitive behavioral patterns =====
These patterns can be seen in the form of repeated movements of the hand or the phrases used while talking. A rigid adherence to schedules and inflexibility to adapt even if a minor change is made to their routine is also one of the behavioral symptoms of ASD. They could also display sensory patterns such as extreme aversion to certain odors or indifference to pain or temperature.{{cn|date=June 2022}}

There are also different symptoms at different ages based on developmental milestones. Children between 0 and 36 months with ASD show a lack of eye contact, seem to be deaf, lack a social smile, do not like being touched or held, have unusual sensory behavior and show a lack of imitation. Children between 12 and 24 months with ASD show a lack of gestures, prefer to be alone, do not point to objects to indicate interest, are easily frustrated with challenges, and lack of functional play. And finally children between the ages of 24 and 36 months with ASD show a lack of symbolic play and an unusual interest in certain objects, or moving objects.<ref name="Dereu, Mieke 2010" />