Stuart Fisher, aged two months, died without warning on New Year's Day 1975. The child of loving parents, he was found dead in his cot. Why should a cherished, healthy child die so unexpectedly? Stuart is not unique, every day eight British babies die without any warning or explanation. In fact Britain now has one of the worst infant mortality rates in Western Europe, and these mysterious ' cot-deaths ' are the biggest single cause of deaths for the under-2s.

But medical research has now discovered clues which may help reduce this death-toll. Finland has drastically reduced its cot-deaths by concentrated health-care in the first few months of life.

Tonight's Horizon asks if we could do the same, and how long it will be before we can prevent the deaths of 3,000 babies who die like Stuart Fisher, without warning and without explanation?