Buggy sport buggy recommended minimum age new born pushchair weight 93 kg backrest continuously adjustable brakes locking brake canopy removable extendible viewing window with utility pockets harness system 5 point safety harness padded seat belt suspension slider adjustable handlebar height 95 x 109 cm folding mechanism one hand fold special feature upholstered seat wheel diameter rear 19 cm wheel diameter front 18 cm number of wheels 4 max