Caleb Ness was shaken to death by his father

Caleb, who was 11 weeks old, was killed after being released from hospital into the care of his brain-damaged father and drug-addicted mother.

His father, Alexander Ness, was jailed for shaking the child to death.

One of the social workers involved in the case no longer works for Edinburgh City Council, but two of the others are to receive further training.

A damning report into Caleb's death, completed last year, found fault "at almost every level in every agency" involved.

It concluded that Caleb's death was avoidable and that "neither parent should have had unsupervised care" of the child.

Funding promise

That report prompted the resignation of Edinburgh's social work director Les McEwan.

Caleb Ness was shaken to death by his father Alexander

Following the case, the council promised to improve procedures for the monitoring of all children on the child protection register, to carry out an annual audit of its child protection practices, and to appoint 11 extra administration staff.

The council also said it would invest �14m on a new social work IT system, and put extra money into the recruitment and training of staff.

The public sector union, Unison, has welcomed the decision not to discipline the social work staff because it said investigators had concluded that no individual was to blame.