Effects of a Short-term Parent Mediated Social Training on Developmental Trajectories in Infants

Inclusion Criteria: * Child participants must be between the ages of 8 months and 12 months at the beginning of the study. * Family must speak English at least 75% in the home. * Children must receive an AOSI concern score ≥7 OR * a T-score of ≤39 on either the Mullen Receptive Language or Expressive Language subscale. OR * Score in the Concern range on either the Composite or Total Score of the parent-completed Communication and Symbolic Behavior Scales Developmental Profile (CSBS DP) Infant-Toddler Checklist. Exclusion Criteria: * History of head injury, seizure disorder, severe aggression or self-injurious behavior, prenatal illicit drug or excessive alcohol exposure. * Any hearing or visual impairment * Any severe birth trauma * Any birth defects or genetic disorders * Gestational age \< 35 weeks and/or Birth weight less than 1,500g * Cannot be living in foster care. * Location of in-home visits \>35 miles of the Center for Autism and Related Disorders