A multiple baseline design across subjects will be used with varying introduction of treatment elements. Baseline periods will be 3, 5, and 7 sessions with the baseline period of 3 and 5 sessions repeated twice for subsequent participants. An intense intervention phase will follow the baseline phase in which 45-60 minute treatment sessions will occur twice per week over the course of 4-6 weeks for a total of 8 sessions. Each week during the intense intervention phase, caregiver coaches will introduce a new treatment technique to the caregiver and allow for caregiver practice with immediate feedback. At the conclusion of the intense intervention phase, coaches will provide "booster" sessions with the caregivers once weekly for 1 month (4 sessions total).

Participants enrolled in a separate protocol (UC Davis IRB ID#1077801) will be invited to participate upon meeting eligibility criteria. All participants will receive the intake and exit assessment battery, with the intake assessment battery being completed as part of IRBNet ID#1077801. A multiple baseline design across participants will be used with varying introduction of treatment elements for a subset of enrolled intervention participants. An intense intervention phase will follow the baseline phase in which 45-60 minute intervention sessions will occur two times per week for approximately 4-6 weeks for a total of 8 sessions. At the conclusion of the intense intervention phase, coaches will provide "booster" sessions once weekly for a month (4 sessions total).

Child duration of orienting during the intervention sessions will be coded from video using a standardized behavioral coding paradigms developed within the investigators' lab.

Child frequency of grabbing behavior during the intervention sessions will be coded from video using a standardized behavioral coding paradigms developed within the investigators' lab.

Child frequency of negative affect during the intervention sessions will be coded from video using a standardized behavioral coding paradigms from the Lab-TAB. Higher levels equate to more negative affect.

Caregiver fidelity of implementation (FI) of the intervention will be coded from 3-minute caregiver-child dyad intervention video probes to determine caregivers' FI of intervention techniques over the course of the study. This involves having experts in the intervention rate caregiver use of each of the intervention strategies on a 1-5 Likert rating scale, with a code of "1" meaning the caregiver did not implement the technique throughout the session and a code of "5" meaning the caregiver implemented the technique correctly throughout the session. An FI score of 80% (determined by total caregiver points out of the maximum possible points multiplied by 100) or higher for the entire intervention session indicates success in caregivers' FI of intervention techniques. Higher values represent greater fidelity.

The total number of parent concerns about child behavior and development will be examined. Fewer concerns reflects more positive outcomes.