Autism spectrum disorder (ASD) is one of the fastest growing childhood disorders, becoming a major public health concern. Studies have shown that children with ASD are more likely to be exposed to perinatal complications than typically developing (TD) children. Sex differences have also been shown to affect ASD diagnoses. However, variables that affect severity of ASD are still understudied. Understanding factors that impact ASD severity may assist in establishing methods to identify ASD outcomes, and target children at high risk for worse outcomes with treatment. The study aims to investigate IQ differences in children with ASD on variables including birth weight, gestational age, sex, and birth order. 150 children (75 males and 75 females) aged 6 to 18 years with a confirmed diagnosis of Autism participated in the study. Autism diagnoses of the participants were confirmed via ADOS-2, a clinician-child measure that scores on child’s social, repetitive behaviors and communication skills. Parents completed a self-reported demographic questionnaire about family demographics, and the Autism Center of Excellence subject medical history form, a medical interview with information on pregnancy complications and child medical history. All subjects completed the DAS-II evaluation tool that measures the cognitive abilities (IQ) of children on verbal and non-verbal domains. We hypothesize that children with lower IQ levels (full scale IQ<80) will have lower average birth weight, average smaller gestational ages and a higher number of pregnancy related complications. We also expect that given the higher rate of ASD incidence in boys, within the ASD group, there will be a main effect of sex with more males (n=75) having higher rate of pregnancy complications than females (n=75). Results will help establish a better understanding of other prenatal variables that may be correlated to later severities of ASD, and provide support for treatment targeted at prenatal risk.