He has gone on to progress through the age groups and last season made 29 starts for the Club's Under-18s side, more than any other player.BCFC
Siviter, who turns 18 on 15 June, has penned a one-year deal, which runs until 30 June 2019, with a further one-year option in the Club's favour,
The Walsall-born youngster first joined Blues at the age of 12 following a successful trial.
He has gone on to progress through the age groups and last season made 29 starts for the Club's Under-18s side, more than any other player.
These included all of the FA Youth Cup games, as Blues reached the semi-final stage before losing to eventual winners Chelsea.
He also racked up three appearances for Blues Under-23s.
A boyhood Blues fan and former season ticket holder, Siviter comes from footballing stock.
His father Neil represented England schoolboys and was in Blues' professional ranks during the mid-1980s until a serious knee injury ended his footballing dreams.
GALLERY: A selection of images of Adam Siviter in action.