Child safety seat and side wing height and width adjustment mechanism therefor

A child safety seat comprising a base, a first backrest, a second backrest, a headrest, and side wings, the first backrest and the second backrest being slidably connected to each other along a height direction of the child safety seat, the headrest being assembled on the second backrest and, together with the second backrest, forming an adjustor for performing a height adjustment with respect to the first backrest, and the side wings being respectively located on two opposite sides of the first backrest, wherein the child safety seat further comprises a side wing height and width synchronous adjustment mechanism, wherein the side wing height and width synchronous adjustment mechanism comprises a first guide rail extending in a width direction of the child safety seat, a second guide rail extending in the height direction of the child safety seat, a first fitting guide member in sliding-fit with the first guide rail, and a second fitting guide member in sliding-fit with the second guide rail, the first guide rail is arranged on one of the side wings or the adjustor, the first fitting guide member is arranged on the adjuster or the one of the side wings, the second guide rail is arranged on the first backrest or one of the side wings, and the second fitting guide member is arranged on the one of the side wings or the first backrest;

• wherein during the height adjustment of the headrest, a height and a width of the side wings are synchronously adjusted in a linkage manner by means of the first fitting guide member sliding on the first guide rail and the second fitting guide member sliding on the second guide rail, wherein the side wings are translated and rotated to open outwardly or contract inwardly with respect to the first backrest under an action of sliding the first fitting guide member along the first guide rail and sliding the second fitting guide member along the second guide rail simultaneously.