Only a tender 19 months old, Leo Blair has been caught up in heated row over government health policy, personal privacy and a controversial vaccine.
It provoked an angry ticking-off from the child's father, the British Prime Minister, for "horrible and unjustified" media attempts to find out if Leo has had a combined vaccine against measles, mumps and rubella. At the same time, Mr Blair came as close as he has done to admitting that Leo has indeed been given the government-recommended triple jab.
Their inquiries, the newspapers at the heart of the debate claim, are being carried out in the public interest amid raging controversy over the safety of the jab, known as MMR.
If Mr Blair does not give Leo the vaccine, they argue, why should anyone else believe his government's insistence that it is not linked to child autism, as some experts claim? Government policy is to recommend children have the triple jab, rather than dearer and allegedly less reliable option of taking them separately.
In a strong statement from Chequers, Mr Blair said that "the suggestion that the government is advising parents to have the MMR jab, whilst we are deliberately refraining from giving our child the treatment because we know it is dangerous, is offensive beyond belief".
Mr Blair said he and wife Cherie never commented publicly on the medical health or treatment of their children.
Calls for details to be made public about Leo, the youngest of the Blairs' four children, have also come from some members of parliament, who insist the prime minister should show leadership.
Mr Blair refused to answer a question on the matter in parliament last Wednesday.