Coach Bellamy and his players went into the match boasting a 100 per cent record in Premier Development League Two South.
Cardiff had earned four wins from four fixtures before their trip to Bristol. They made two changes to their starting line-up with Ben Margetson and Sam Parsons called up.
U18 | FULL-TIME: @BristolCity 1-0 @CardiffCityFC.
Cardiff City's unbeaten run comes to an end in Bristol. #CityAsOne 🔵⚽️🔵⚽️ pic.twitter.com/AXT5rymkUx
— Cardiff City Academy (@CF11Academy) September 15, 2018
Trystan Jones, Sion Spence and Daniel Griffiths scored during Cardiff’s 3-1 win against Hull City at home last time out, but Bellamy’s boys could not score against their Severnside rivals.
Isaak Davies went close after a brilliant run, shooting just wide with goalkeeper Will Buse struggling to save.
Griffiths forced Buse into a save before Bristol City went ahead with 33 minutes gone. Sam Pearson crossed picked out Marcus Day and he finished clinically from close range.
Cardiff made a double substitution after 65 minutes, sending on Eli King and Jac Davies for Rubin Colwill and Sam Parsons, while Ntazana Mayembe replaced Connor Davies 13 minutes later.
Bellamy’s under-18 Bluebirds entertain Crystal Palace at Cardiff International Sports Arena on Saturday, September 22 and they are again at home on Saturday, September 29, against Watford (both 11am).
Bristol City: Buse, Smith, Soady, Owers, Lapota, Webb, Pearson, Smith (capt), Bell, Taylor, Day. Subs: Pearson, Sainsbury, Conway, Hall, Harper.
Cardiff City: George Ratcliffe, Ben Margetson, Trystan Jones, Joel Bagan, Connor Davies (Ntazana Mayembe 78), Sam Bowen (capt), Ryan Reynolds, Sam Parsons (Jac Davies 65), Rubin Colwill (Eli King 65), Daniel Griffiths, Isaak Davies. Subs not used: Jordan Duffy, Henry Smith.