Methods for delivering an effective amount of insulin to the central nervous system to treat Social Communication Disorder while minimizing systemic exposure to the administered insulin. The present invention provides these advantages by administering at least an effective amount of insulin and/or pharmaceutical composition(s) thereof, to the upper third of the nasal cavity, thereby bypassing the blood-brain barrier and delivering an effective amount of insulin and/or pharmaceutical compound(s) thereof directly to the CNS. Further methods comprise administering an at least an effective amount of therapeutic agents to the amniotic fluid surrounding a fetus with a treatable neurologic agent or a preventable neurologic condition. For example, administering the at least effective amount of insulin to the amniotic fluid of a fetus with a mother diagnosed with gestational diabetes may prevent the fetus from developing Social Communication Disorder or autism.