A child safety seat utilizes a compression-type resilient shock absorber in which a soft-material resilient member serves to dampen shocks applied to the seat's harness assembly by undergoing compressive deformation in a way that prevents the harness safety belts from experiencing a “hard stop”. The resilient member (e.g., a foam rubber block, a gel-like substance, or a fluid-filled bladder) is disposed such that one portion is held against a rigid support (e.g., the backside surface of the seat's shell), and a second portion is operably coupled to a fixed end of a safety belt. The resilient shock absorber is oriented such that tension applied to the safety belt pulls the two end portions of the resilient member toward each other and against the rigid support, thereby causing the resilient member to compressively deform against the rigid support.