Language is the main means of ensuring communication between the members of a society. However, not all children succeed in developing functional language skills. Speech, and by extension language, is one of the areas that is delayed and severely deficient in individuals with autism spectrum disorder (ASD). Research evidence highlights the effects of fetal testosterone on children's neurodevelopment, including language disorders associated with autism spectrum disorder (ASD). The present work was designed to study the ratio of the length of the second (index) finger to the fourth (middle) finger, as a biological indicator of prenatal testosterone exposure, to understand individual differences in language skills of children with autism spectrum disorder. The early detection of language deficits in combination with the assessment of the language performance of children with (ASD) may create perspectives for differentiating the educational process. In particular, early intervention makes it possible to prevent the severity with which the autism spectrum disorder manifests itself and can cause changes in the language development of children with (ASD).