Tragically, instead of presents and a cake, he has his own page on Bebo, where supporters are being urged to lobby the highest lawyer in the land in a bid to have his killer’s sentence increased.

Brandon was just 23 months old when he died on March 16 last year. He had suffered a ruptured spleen and had sustained 40 injuries in the last three weeks of his life, while living with his mother Heather Boyd and Cunningham at a flat in Balunie Crescent.

Cunningham was found guilty of killing Brandon in what temporary judge John Morris QC described as “a wanton act of violence against an innocent child”.

Boyd originally stood trial for culpable homicide, on the basis she had failed to provide medical help for her son, but was cleared of all charges against her.

Brandon’s father, John Muir, has opened his heart to the Tele about his anger over what he sees as Crown prosecutors’ failure to win justice for his son.

“I really can’t understand how he only got 10 years and Heather has been let off with everything,” he said.

Heather’s parents, Veronica and Raymond Boyd, also slammed the sentence.

“If it was up to me, I would have thrown away the key,” declared Mrs Boyd.

Now, the RealJustice4Brandon campaign is hoping the public will bombard Scotland’s top judge with letters.

The campaign’s page on the Bebo networking site now includes the text of a letter appealing against the “leniency” of Cunningham’s sentence.

Supporters are being asked to copy the letter and send it to Lord Hamilton, who as Lord Justice General and Lord President of the Court of Session is the country’s most senior judge.

The letter reads, “I believe the decision taken by the judge was extremely lenient due to the horrific and painful death inflicted on an innocent, defenceless baby boy.”

It continues, “The 10-year sentence could see Cunningham, who we believe is a danger to other children and members of the public, walking the streets in four years.

“It is not our belief that this can in any way be seen to be justice for such a serious crime.”

The letter maintains that, given “the severity of this crime and the danger that Cunningham poses to the general public,” a life sentence should have been handed down.

However, a spokesperson for the Crown Office stressed that the review of Cunningham’s sentence was being carried out as a matter of routine.

“The Procurator Fiscal at Dundee is aware of the views of members of the victim’s family and will pass the matter to Crown Counsel for their consideration as to whether the sentence is unduly lenient,” she said.

“In cases of a serious nature such as this, Crown Counsel will routinely consider whether the sentence imposed is within the range available to the judge in the exercise of his or her discretion.

“The fact this is done should not be taken as indicating a view that the sentence is unduly lenient.”