Paul Stephenson's side had the better of the possession and chances in the first half, but the Magpies struck the decisive blow in the second period through Tom Allan. 

Boro had further opportunities to claw back and earn a point, but the Newcastle rearguard held firm to keep the hosts at bay in the final league game of the season. 

Watch extended highlights from Boro's U23s v Newcastle United in the video player above.