During the time of a child's development, fears are unavoidable and normal for that period. They have their own characteristics of evolution and manifestation in any period of a child's upgrowth.
It's obvious that fears of children with different upgrowth disorders are expressed within particular patterns. So we carried out an exploration in order to study the particularities of the patterns of children's mental upgrowth disorders and children with autism spectrum disorders and during studies we investigated 60 children with mild mental upgrowth disorders and 60 children with autism spectrum disorders. The fears of preschool children representing these two types were investigated in the context of a comparative analysis of the particularities of the fears of their peers with neurotypical development.