Bell-Baggie spent part of last season on loan at Rotherham, making 12 appearances including one at Wembley in the League Two play-off final.
The pacy wide-man has been brought in as cover for Lewis Haldane, who remains some way behind his team-mates in terms of fitness.
Bell-Baggie has been at Reading since he was nine but is yet to feature in the first team at the Madejski Stadium.
Source: BBC Sport
Source: BBC Sport