Tandem pushchair recommended minimum age new born pushchair weight 125 kg carrycot pushchair seat backrest 3 positions harness system 5 point safety harness series cosatto shuffle wheel settings swivelling lockable number of wheels 4 safety bar with bumper bar dimensions 113 x 51 x 100 cm dimensions folded 120 x 37 x 39 cm included in delivery canopy footmuff carry strap rain cover head hugger shopping bag bumper bar