After a goalless first forty-five minutes 'Boro defender Seb Hines put the visitors ahead on the hour mark.
Blues had chances to level but 'Boro doubled their lead through Danny Graham just two minutes from time.
Keith Bertschin's side have now gone seven games without a win whilst the 2-0 scoreline at St Andrew's tonight sent Boro Reserves top of the Barclays Premiership Reserves League (north) table on goal difference.
Blues Res: Doyle, Cottrill, Sadler, Oji, Painter, Alsop, Wright, Kilkenny, Birley, Aluko, Till. Subs: Legzdins, Asa Hall, Howland, McPike, Blake.
Boro Res: Bates, Burgess, Cattermole, Cooper, Craddock, Graham, Grounds, Hines, Kennedy, Knight, Liddle. Subs: Robson, Owens, Walker.