Inclusion Criteria:  Children should be enrolled in the early intervention (EI) service and diagnosed with ASD determined by clinical assessment with the Autism Diagnostic Observation Schedule (ADOS) score if available. Children birth to 36 months are eligible for the EI services, and therefore, age of our research participants will range from birth to 36 months. Both the child and the parent should be available during the EI service time. Parents should be 18 years or older and speak fluent English and/or Spanish  Exclusion Criteria:  Children who are on exclusive breastfeeding, medicines that may interact with appetite and food consumption, having severe GI conditions such as irritable bowel syndrome, diagnosed with feeding disorders or severe food selectivity (consuming fewer than 5 food items), or other serious medical comorbidities such as cancer. Children who are receiving the EI service at a daycare setting or other than home setting. Parent and child with ASD who have previously participated in a similar nutrition intervention study will also be excluded. Parent's first language is not English or Spanish.