Twenty-five years spans a generation, with its attendant social change and shifts in attitude, but from one generation to the next, it's sometimes difficult to convey the extent of incremental progress.

A generation ago, at the UN General Assembly in New York, the United Nations Convention on the Rights of the Child (UNCRC) was adopted. Those children born in the first year of its existence are now adults, and I hope, for some at least, that the Convention has made a difference to their lives.

The Convention represented a global promise to protect and promote a child's right to survive and thrive, to learn, to be healthy, to make their voices heard and to achieve their full potential. But 25 years on, despite significant change, there is still much to be done.

In celebrating this anniversary, it is useful to reflect on how far we have come as well as where we must go, to remain true to the spirit of the Convention.

The UNCRC changed the way children are viewed and treated and the fact it is the most widely ratified human rights treaty in history, shows a global commitment to advancing children's rights.

Though conventions are sometimes dismissed as statements of high-minded ideals, I believe the UNCRC can act as a touchstone for anyone trying to effect change.

In Scotland, I have seen excellent examples of children and young people being recognised as rights-holders. For example, the recent Children and Young People (Scotland) Act 2014 reflected the broad shift in towards better realising children's rights.

And strenuous efforts have been made to tackle health inequalities with a focus on prevention and early years. The Convention brings a global perspective to how we do things in Scotland. Our approach to juvenile justice is recognised around the world, further enhanced through the Children's Hearings Act where children's rights became the principles the system is based on.

While these are all significant achievements, it would be blinkered not to recognise how much more we can do. Too many children are still regarded as the property of adults and subjected to various forms of abuse and exploitation.

Nor can we claim we live in a world where "children's best interests are the primary consideration in all decisions affecting them" (Article 3 UNCRC).

Sadly, all too often children are the victims of poverty. Just last month, parent groups and teaching unions warned inequalities will become entrenched and councils in Scotland may fail to meet legal obligations on education because of spending cuts. The BMA recently published a report raising serious concerns about the health and human rights of children in the UK criminal justice system.

Issues like these highlight why this anniversary must be an urgent reminder about what remains to be done to realise the vision of the UNCRC. I believe we need to use the UNCRC in its widest sense as a legal instrument that defines the responsibilities of Governments, as a framework for action and as an ethical statement.

There are areas where we need to be more assertive on children's rights. I am concerned about the rights of the most vulnerable, especially disabled children and young people. Welfare reform and austerity are leading to cuts that impact directly on children's services, care facilities, social work and recreational facilities.

I am also concerned that, despite evidence of increases in serious mental health problems in under-18s, too many children continue to wait for treatment or are treated in inappropriate places, in violation of their rights. The post-referendum discussions are a natural juncture for those working to advance children's rights to consider how we might better do this under a new constitutional framework.

A new approach could see the UNCRC incorporated into Scots law, placing on our Government clear responsibility to put the best interests and views of children and young people at the centre of every decision they make.