Lower anchors in belt-positioning-boosters (BPBs) have been previously evaluated only in frontal impacts. As many caregivers use BPBs without the lower anchors connected, potentially during travel with a child, it’s important to understand how the lower anchor connection may influence the child’s kinematics and kinetics across different impact angles. This study aims to understand how different BPB models perform in lateral and frontal oblique impacts with and without the lower anchor, and to understand the crash benefit of keeping highback-to-backless BPB in highback mode in the context of the lower anchor use.