A child safety seat 100 includes a seat shell 104, an adjustable headrest 112 and a child restraining harness 140. The seat shell has a backrest portion 108, a sidewall protruding forward from the backrest portion, and a first rod inside the seat shell. The adjustable headrest 112 is movable along the backrest portion, the headrest being fixedly connected with a second rod and a spacer that are located adjacent to each other. The child restraining harness 140 has a harness strap, the harness strap wrapping around the first rod 144 and forming two folded strap portions 142A&B that extend downward from the first rod, one of the two folded strap portions wrapping around the second rod 146, and the spacer 148 being disposed between the two folded strap portions for preventing a contact between the two folded strap portions. Moreover, some embodiment may provide a latch belt (fig1, item154) disposed transversally across the seat shell and having two opposite ends respectively provided with two connectors for attachment to an anchorage provided in a vehicle, and a storage compartment on a rear of the backrest portion adapted to receive the two connectors of the latch belt.
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