Back in U18 Premier League South action following defeat to West Ham United, the Foxes youngsters took on the Baggies at WBA Training Ground, but were unable to get back to winning ways when travelling across the Midlands.
West Brom captain Akeel Higgins opened the scoring for the home side just under 10 minutes before the half-time break and doubled their advantage three minutes later via Fenton Heard's effort.
It remained that way until 20 minutes from the end when Deago Nelson set up Archie Oliver to add further gloss to the scoreline.
Now 12th in the U18 Premier League South table, with seven points from their opening nine games, Leicester's Under-18s meet Arsenal at LCFC Training Ground this Saturday (11:30am GMT kick-off).
The details…
City: Addai, Cook (McAlinney 58'), Wilson-Brown, Grist (Ali 69'), Lindsay, Briggs, Cartwright (c), Lewis (Thomas 62'), Javaid (Toure 69'), Evans, Richards.
Unused sub: Bausor.