The proposed study (PETAL: Promoting Early intervention Timing and Attention to Language) aims to determine the timing of intervention among infants with Increased Likelihood for Autism (ILA; at risk for autism by virtue of having an older sibling with autism) on communication and language outcomes at 24 months. Results of this study will determine when (9 vs 12 vs 15 months), and based on which measures (brain, language, or their combination) to augment parental support with a specialized parent-mediated coaching intervention for optimal outcomes on communication and language at 24 months. Children will be recruited at 6-8 months of age and will begin with entry assessments. All children will first begin with the MONITOR condition (using Ages \& Stages Questionnaire (ASQ-3) and activity cards. Then when the child is 9 months, they will be randomized to continue with MONITOR condition or COACH condition (incorporates JASPER intervention and Babble Bootcamp) after second set of assessments. There are a total of 6 assessment timepoints (6-8 months of age, 9 months of age, 12 months of age, 15 months of age, 18 months of age, and 24 months of age). At time points of 9months and 12 months, the child will be randomized to COACH or MONITOR conditions. Once the child is randomized to COACH condition, they will continue with that condition until they terminate the study at 24 months. At the 15 months timepoint, there will no longer be a randomization. Children that were in the MONITOR condition will change to the COACH condition until they terminate the study.